10 c to f

68°F and 86°F. 25°C will be about halfway between these two temperatures. So it's about. 80°F. 3. Which is colder 10°F or 10°C? Temperature in celsius is −oC. Explanation: If F is the temperature in Fahrenheit and C is temperature in Celsius then. A change of 1 degree Celsius is equivalent to a change of degrees Fahrenheit. Δ 1 °C = Δ °F. Where the Greek capital letter Delta, Δ, means "a change of.

: 10 c to f

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With this program, the units of temperature (degrees Celsius, Kelvin and degrees Fahrenheit) can be converted.

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Definition of temperature:

The tendency of a substance or an object to transfer heat to its surroundings.

Definition of the thermodynamic temperature:

The Kelvin, unit of thermodynamic temperature, is the fraction 1/ of the thermodynamic temperature of the triple point of water (13de CGPM (), Rés. 4)
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In the 13th CGPM in was decided that the unit of temperature will be the Kelvin, and not 'degrees Kelvin'. The triple point of water is K, which is oC (degrees Celsius).

Definition of Celsius:

The Celsius-scale is defined by the follow two points:

  1. The triple point of water is defined as oC.
  2. One degree Celsius equals the change of temperature with one degree on the ideal gas-scale.

The triple point is a theoretical point where the three phases of a matter (for example water) come together. This means that liquid, solid and gas phase from a matter appear at the same time. This is practically impossible.

History of measuring temperature:

The idea of measuring temperature exists a long time. One of the first who wanted to make a temperature scale was Galen (ca. ). He had a scale of 4 degrees warmth and 4 degrees of cold. The earlier measurement instruments for temperature where called thermo scopes. In Galileo introduced wine in the thermo scopes instead of air. In Gabriel Fahrenheit introduced the medium mercury in the thermo scopes. The reason that mercury was used is that the thermal expansion of mercury is large, mostly homogeneous and it does not stick on the glass. Mercury also stays in the liquid phase for a great range of temperature. It is also easy to read.

Present temperature scales:

Present temperature scales have two basic points: from when the water starts to freeze and when it starts to boil. Between these two temperatures a scale is made. The two most popular scales are the Celsius (made by Anders Celsius) and Fahrenheit (made by Gabriel Fahrenheit) scale. The Fahrenheit scale is defined so that the melting point of water lays by 32 degrees Fahrenheit and the boiling point lays by degrees Fahrenheit. This means that between the freezing point and boiling point there are divisions. Fahrenheit introduced his scale in

Another scale is the Celsius scale. In the Celsius scale the freezing point of water is set at 0 degrees (centigrade) and the boiling point at degrees (centigrade). This scale exists on divisions, also known as centiscale. In the centidegrees (centigrade scale) were replaced by the degrees Celsius (oC). The Celsius scale is defined by the following two points:

  1. The triple point of water is defined at oC.
  2. One degree Celsius equals the change of temperature with one degree on the ideal gas-scale.

On the Celsius-scale the boiling point of water with a pressure of 1 atmosphere is set at oC. With the centiscale it was

SI temperature scale:

Temperature is related with the kinetic energy of the molecules. The kinetic energy changes when the temperature changes. Temperature is defined as the translation of heath between two objects. The fundamental temperature scale is the one of Kelvin. The temperature scale of Kelvin depends of the absolute zero point. This is the point where the molecules do not move anymore, so they do not give warmth. This is for all molecules. The absolute zero point is by 0 K, this is oC. The scale is the same as the Celsius.

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Suggested reading for the topic: Mercury

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Convert Celsius to Fahrenheit

Home / Temperature Conversion / Convert Celsius to Fahrenheit

Please provide values below to convert Celsius [&#;C] to Fahrenheit [&#;F], or vice versa.


Celsius

Definition: The Celsius (symbol: °C) is an SI (International System of Units) derived unit of temperature. It is defined based on the SI unit of temperature, the kelvin. The Celsius and Kelvin scales are precisely related, with a one-degree change in Celsius being equal to a one degree-change in kelvin. The kelvin (and thus Celsius) is defined based on the Boltzmann constant, k, which equals &#; 10 when expressed in the unit J&#;K-1, a unit equivalent to kg&#;m2&#;s-2&#;K-1. The kilogram, meter, and second, are defined based on Planck's constant, h, the speed of light, c, and cesium frequency, ΔνCs.

History/origin: From until , the Celsius scale was based on 0°C for the freezing point of water and °C for the boiling point of water, both at a pressure of one standard atmosphere, using mercury as the working material. This was not always the case, and originally 0°C was defined as the boiling point of water and °C was defined as the melting point of snow. Celsius as a unit and a scale was not widely used until this original definition was inverted. In , the unit, "degree Celsius," as well as the Celsius scale were again re-defined to instead be based on absolute zero ( °C) and the triple point of VSMOW (specially purified water). This is the definition that was used up until , when the kelvin was redefined based on the definitions of the second, meter, and kilogram.

Current use: The Celsius scale replaced the Fahrenheit scale in most countries in the mid to late 20th century. Almost all countries around the world use this scale, except for those in which the metric system has not been adopted, such as the United States. Even in countries like the United States however, Celsius is widely used within the scientific community—it just is not widely used in everyday temperature references.

Fahrenheit

Definition: The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at which water freezes, 32°F, and the boiling point of water, °F, both at sea level and standard atmospheric pressure. The interval between the freezing and boiling point is divided into equal parts.

History/Origin: The Fahrenheit scale was developed based on a measurement proposed in by the German physicist Daniel Gabriel Fahrenheit. He initially based the scale on an equal ice-salt mixture, selecting the values of 30°F for the freezing point of water, and 90°F for normal body temperature. He later adjusted the scale such that the melting point of ice was 32°F and body temperature was 96°F. He chose these values to simplify the degree markings he could make on his instruments, since this difference between the temperatures allowed him to mark degree lines by bisecting the interval six times. Later, when using the freezing and boiling points of water as fixed reference points for thermometers became popular, the scale was slightly re-defined such that there would be degrees separating freezing and boiling point, resulting in normal human body temperature being approximately 98°F, rather than Fahrenheit's 96°F.

Current use: Until the 's the Fahrenheit scale was the primary scale used in English-speaking countries. Today, most countries around the world use the Celsius temperature scale instead, many having made the change during their metrication processes (conversion to using the metric system of units). However, the Fahrenheit scale is still used as the official temperature scale in a number of countries, including the United States (as well as its unincorporated territories), the Bahamas, Belize, the Cayman Islands, and a few others.



Celsius to Fahrenheit Conversion Table

Celsius [&#;C]Fahrenheit [&#;F]
&#;C &#;F
&#;C &#;F
1 &#;C &#;F
2 &#;C &#;F
3 &#;C &#;F
5 &#;C41 &#;F
10 &#;C50 &#;F
20 &#;C68 &#;F
50 &#;C &#;F
&#;C &#;F
&#;C &#;F


How to Convert Celsius to Fahrenheit

Example: convert 15 &#;C to &#;F:
15 &#;C = 15 × 9/5 + 32 = 59 &#;F



Popular Temperature Unit Conversions


Convert Celsius to Other Temperature Units

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The United States uses degrees Fahrenheit to measure the temperature of almost everything while most of the rest of the world uses degrees Celsius. From your body temperature to cooking temperatures, if you need to convert one unit of measurement to the other, use our converter widget to make an easy calculation.

Converting Units of Temperature Measurement

Fahrenheit (°F) and Celsius (°C) are the units of measurement of the two temperature scales in most common daily usage today. These two different scales of measurement express a range of temperatures from below the freezing point to above the boiling point of water.

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Temperature Conversions

Meteorologists, researchers, doctors, students, cooks, and many others often have a need to convert temperatures from one scale to the other. You can make the calculation by using the conversion formulas for each system. However, our widget converter, embedded with the formulas, simplifies the calculation and does the work for you.

Using the Widget Converter

The widget converts both Celsius to Fahrenheit and the reverse:

  • To convert Celsius to Fahrenheit, enter the temperature in degrees Celsius in the first field.
  • To convert Fahrenheit to Celsius, instead enter the temperature in degrees Fahrenheit in the second field.
  • After either line, click the corresponding "Calculate" button to get your answer, either in degrees Fahrenheit or in degrees Celsius.
  • To clear your entries to do a new calculation, click on the "Clear" button.

Making Your Own Calculations

If you want to do your own calculations without the widget, use the conversion formulas as follows:

To convert from Fahrenheit to Celsius:

  • The formula is: Temperature in Celsius = (Temperature in Fahrenheit minus 32) multiplied by the fraction 5/9.
    • That is: °C = (°F - 32) × 5/9
  • Example: Convert degrees Fahrenheit to degrees Celsius
    • Calculation: (°F - 32) × 5/9 = 37°C

To convert from Celsius to Fahrenheit:

  • The formula is: Temperature in Fahrenheit = Temperature in Celsius multiplied by the fraction 9/5, then add
    • That is: °F = (°C × 9/5) + 32
  • Example: Convert 37 degrees Celsius to degrees Fahrenheit:
    • Calculation: (37°C × 9/5) + 32 = °F

Temperatures of Interest

The Celsius and Fahrenheit temperature scales have minus 40 degrees (°) in common. Otherwise the Fahrenheit scale has a larger number than the Celsius scale to express the same temperature. On the Fahrenheit scale, the interval between the freezing and the boiling point of water is set at °, while that of the Celsius scale is set at °.

All around the world, the temperature of the day is of interest to people, so they know how to dress for the day, for example, especially as the seasons change. Body temperature is also of interest, as doctors rely on the reading as an indicator of illness or wellness, and even as a sign of fertility.

The following chart displays a sample of interesting temperature measurements.

Temperatures of InterestFahrenheitCelsius
Absolute zero
Shared temperature
Freezing point of water 32 0
Average temperature on Earth 59 15
Average room temperature 72 23
Normal human body temperature

Boiling point of water

Easy Access to the Right Temperature

Converting temperature readings from Celsius to Fahrenheit, or vice versa, is simplified by using our conversion widget. It is always available to you because you can access it from our site on any of your electronic devices.

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Celsius to Fahrenheit (°C to °F)

Simple, quick °C to °F conversion

Celsius to Fahrenheit conversion is probably the most confusing conversion there is, but a simple °C to °F conversion is actually quite easy – just double the °C figure and add This should be reasonably accurate for weather temperatures.

Absolute Zero°C°F
Parity°C°F
Freezing point0°C32°F
Body Temperature37°C°F
Boiling point°C°F

Celsius and Fahrenheit definition

The Celsius temperature range was originally defined by setting zero as the temperature at which water froze. Zero degrees C was later redefined as the temperature at which ice melts. The other point at which Celsius was set – degrees Celsius – was defined as the boiling point of water.

Since its definition, the Celsius scale has been redefined to peg it to Kelvin. Zero degrees Celsius is now defined as K. As one degree Celsius is equal to one Kelvin, boiling point of water is equal to + = Kelvin.

The Fahrenheit temperature range is based on setting the freezing point of water at 32 degrees, and boiling to degrees. This means that boiling and freezing point are degrees apart. Absolute zero is defined as °F.

Celsius to Fahrenheit formula

°F =

°C *

+

Why is converting Celsius to Fahrenheit so difficult?

Because both Celsius and Fahrenheit scales are offset– ie neither are defined as starting at zero. On top of that, for every additional unit of heat energy the Celsius and Fahrenheit scales add a different additional value. Because of this setup, it’s impossible to say that doubling the °C or °F value doubles the amount of heat energy, so it’s difficult to get an intuitive grasp of how much energy 1 degree Fahrenheit or Celsius actually is.

The only temperature system that works intuitively – where a doubling of value doubles the energy – is Kelvin, where absolute zero is 0, body temperature is K and boiling water is K. The problem with the Kelvin scale is that the zero end of the scale is too far from human experience to be useful – as anyone who set their room temperature to Kelvin would attest, if they lived long enough.

What is the difference between Centigrade and Celsius?

It’s just a naming convention. Degrees Centigrade and degrees Celsius are the same thing. Degrees Celsius (invented by Anders Celsius) are sometimes called Centigrade, because the scale was defined between 0 and degrees, hence centi-grade meaning a scale consisting of 1/ths.

Common conversions from Celsius to Fahrenheit

  • 25°C= 77°F
  • 30°C= 86°F
  • 33°C= °F
  • 35°C= 95°F
  • 40°C= °F
  • °C= °F

Common misspellings of Celsius

Common misspellings of Fahrenheit

  • Farenheit
  • Farenheight
  • Ferenheit
  • Ferenheight
  • Ferinheit
  • Ferinheight
  • Fahrinheight
  • Fahenhiet
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feature_celsius_fahrenheit_thermometer

In every science class, you must know how to use and interpret the Celsius temperature scale. But this can be difficult for students who are used to using Fahrenheit instead. How do you convert Celsius to Fahrenheit? What about Fahrenheit to Celsius?

We answer these questions below, giving you the mathematical formulas for converting between these two temperature units, a handy conversion chart, and a quick conversion trick you can use without having to grab a calculator.

 

Celsius vs Fahrenheit: Key Differences

Before we explain how to convert Celsius to Fahrenheit (and Fahrenheit to Celsius), let’s review the main differences between the two temperature scales.

Celsius (written as °C and also called Centigrade) is the most common temperature scale in the world, used by all but five countries. It’s part of the International System of Units (SI), or what you might know as the metric system, which is typically used in science classes (think centimeters, meters, kilograms, milliliters, etc.) and in science as a whole.

By contrast, Fahrenheit (written as °F) is only used officially by five countries in the world:

  • United States
  • Belize
  • Cayman Islands
  • Palau
  • Bahamas

Fahrenheit is not part of the metric system; rather, it’s part of the Imperial system, which includes forms of measurements such as inches, feet, pounds, gallons, etc. Moreover, unlike Celsius, it is not typically used in science.

 

Celsius to Fahrenheit Formula

Unfortunately, converting from Celsius to Fahrenheit isn’t easy to do quickly or in your head. Here are the formulas used to convert Celsius to Fahrenheit and Fahrenheit to Celsius. These formulas will give you the exact conversion from one unit of temperature to the other:

Celsius to Fahrenheit Formula: (°C * ) + 32 = °F

Fahrenheit to Celsius Formula: (°F - 32) / = °C

For example, say the temperature outside is 18 °C and you want to know what this would equal in Fahrenheit. Here’s how your equation would look once you plug in 18 for °C:

(18 * ) + 32
() + 32
= °F

Here’s another example if you want to convert Fahrenheit to Celsius: say you’re feeling ill and your body temperature is °F. To find out what this equals in Celsius, simply plug into the °F part in the second equation written above:

( - 32) /
() /
= °C

As you can see, these conversions aren’t particularly hard to carry out, but they do take some time and aren’t the easiest to do without a calculator on hand.

Luckily, there’s a shortcut. By memorizing some of the most common temperatures that come up in daily life, you should have no problem being able to convert from Celsius to Fahrenheit and vice versa. We’ll take a look at how to do this next.

 

body_thermometersIt's gettin' hot in here.

 

Celsius to Fahrenheit Conversion Chart

Below is a conversion chart listing some of the most commonly used temperatures in everyday life when converting from Celsius to Fahrenheit. Memorize these and you’re sure to have an easier time converting from Celsius to Fahrenheit (and vice versa) fast.

Note: I’ve bolded all temperatures that don’t apply to weather but are still important to know, especially for science class.

 

Temperature in Celsius (°C)

Temperature in Fahrenheit (°F)

Boiling Point of Water

Extremely Hot Day

40

Body Temperature

37

Hot Day

30

86

Room Temperature

20

68

Chilly Day

10

50

Freezing Point of Water

0

32

Very Cold Day

14

Extremely Cold Day

-4

Parity*

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*The point at which the two temperature units are equivalent ( °C = °F).

As you can see from this chart, Fahrenheit temperatures are typically a lot higher than their equivalent Celsius temperatures are.

Also, notice how the difference between Celsius and Fahrenheit starts to get smaller the lower you go in temperature—until, that is, they're the exact same! As the chart indicates, °C is the same temperature as °F.This point is called parity, meaning the two scales use the same value to represent the same temperature. Unfortunately (or fortunately, since this is pretty cold!), you likely won’t come across this temperature in your daily life.

Note that parity only happens at °. The lower you go after parity (i.e., the further you go into the negatives), the bigger the difference starts to become again between Celsius and Fahrenheit.

 

How to Convert Celsius to Fahrenheit: Quick Trick

If you find yourself needing to quickly convert Celsius to Fahrenheit, here is a simple trick you can use: multiply the temperature in degrees Celsius by 2, and then add 30 to get the (estimated) temperature in degrees Fahrenheit. This rule of thumb is really useful and also pretty accurate for most weather-related temperatures.

For example, if the temperature outside is 15 °C, this would come out to around 60 °F:

(15 * 2) + 30
(30) + 30
=60 °F (In reality, 15 °C is equivalent to 59 °F—that’s pretty close!)

Of course, expect the actual temperature to be a few degrees off, but for the most part, this is a reliable and easy way to convert temperatures in your head fast.

If you want to convert Fahrenheit to Celsius, do the opposite: subtract 30 from the temperature in degrees Fahrenheit, and then divide by 2 to get the temperature in degrees Celsius.

For example, if the temperature outside is 84 °F, this would be roughly equal to 27 °C:

(84 - 30) / 2
54 / 2
= 27 °C (In reality, 84 °F is equivalent to °C—again, that’s a pretty close estimate!).

 

What’s Next?

Are you studying clouds in your science class? Get help identifying the different types of clouds with our expert guide.

Now that you know how to convert Celsius to Fahrenheit, the next question to answer is what kinds of spiders live in what sorts of climates? Learn more with our articles about camel spider myths and reasons not to fear the garden spider.

Want even more practice with conversions? (Who wouldn't?) Learn how many cups 4 quarts is here.

Working on a research paper but aren't sure where to start?Then check out our guide, where we've collected tons of high-quality research topics you can use for free.

Need help with English class—specifically with identifying literary devices in texts you read? Then you'll definitely want to take a look at our comprehensive explanation of the most important literary devices and how they're used.

 

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Conversion of Temperature

Quick Celsius (°C) / Fahrenheit (°F) Conversion:

measure/images/usacreditunion.us?mode=boxes

Type a value in either box

 

Or use the slider

Or the Interactive Thermometer

Or this method:

°C to °FDivide by 5, then multiply by 9, then add 32
°F to °CDeduct 32, then multiply by 5, then divide by 9

(Explanation Below )

Typical Temperatures

(only bold are exactly the same)

 °C°FDescription
 Hot Oven
 Moderate Oven
 Water boils
 40Hot Bath
 37Body temperature
 3086 Beach weather
 2170 Room temperature
 1050 Cool Day
 0 32 Freezing point of water
 −180Very Cold Day
 −40−40 Extremely Cold Day
(and the same number!)

16 is about 61
28 is about 82

Explanation

There are two main temperature scales:

  • °C, the Celsius Scale (part of the Metric System, used in most countries)
  • °F, the Fahrenheit Scale (used in the US)

They both measure the same thing (temperature!), but use different numbers:

  • Boiling water (at normal pressure) measures ° in Celsius, but ° in Fahrenheit
  • And as water freezes it measures 0° in Celsius, but 32° in Fahrenheit

Like this:

temperature freeze (0 vs 32) and boil ( vs )

Looking at the diagram, notice:

  • The scales start at a different number (0 vs 32), so we will need to add or subtract 32
  • The scales rise at a different rate ( vs ), so we will also need to multiply

And so, to convert:

from Celsius to Fahrenheit: first multiply by , then add 32

from Fahrenheit to Celsius: first subtract 32, then multiply by

can be simplified to 95,
and can be simplified to 59, so we get this:

°C to °F:   Divide by 5, then multiply by 9, then add 32

°F to °C:   Subtract 32, then multiply by 5, then divide by 9


Example: Convert 25° Celsius (a nice warm day) to Fahrenheit

First: 25° / 5 = 5
Then: 5 × 9 = 45
Then: 45 + 32 = 77° F

Example: Convert ° Fahrenheit (normal body temperature) to Celsius

First: ° − 32 =
Then: × 5 =
Then: / 9 = 37° C

We can swap the order of divide and multiply if we want, but don't change the add or subtract. So this is also OK:

Example: Convert ° Fahrenheit to Celsius (again)

First: ° − 32 =
Then: / 9 =
Then: × 5 = 37° C

(Same answer as before, was it easier or harder this way?)

We can write them as formulas:

Celsius to Fahrenheit:   (°C × 95) + 32 = °F
Fahrenheit to Celsius:   (°F − 32) × 59 = °C

 

Other Methods That Work

Use instead of 9/5

9/5 is equal to , so we can also use this method:

Celsius to Fahrenheit:   °C × + 32 = °F
Fahrenheit to Celsius:   (°F − 32) / = °C

To make "×" easier we can multiply by 2 and subtract 10%, but it only works for °C to °F:

Celsius to Fahrenheit:   (°C × 2) less 10% + 32 = °F

Example: Convert 20° Celsius (A nice day) to Fahrenheit

  • 20x2 = 40
  • less 10% is 40−4 = 36
  • 36+32 = 68° F

 

Add 40, Multiply, Subtract 40

Since both scales cross at −40° (−40° C equals −40° F) we can:

  • add 40,
  • multiply by 5/9 (for °F to °C), or 9/5 (for °C to °F)
  • subtract 40

Like this:

Celsius to Fahrenheit:   Add 40, multiply by 9/5, then subtract 40
Fahrenheit to Celsius:   Add 40, multiply by 5/9, then subtract 40

Example: Convert 10° Celsius (A cool day) to Fahrenheit

  • 10+40 = 50
  • 50×9/5 = 90
  • 90−40 = 50° F

To remember 9/5 for °C to °F think "F is greater than C, so there are more °F than °C"

 

Quick, but Not Accurate

Celsius to Fahrenheit:   Double, then add 30
Fahrenheit to Celsius:   Subtract 30, then halve

Examples °C → °F:

  • 0° C → 0+30 → 30° F (low by 2°)
  • 10° C → 20+30 → 50° F (exact!)
  • 30° C → 60+30 → 90° F (high by 4°)
  • ° C → +30 → ° F (high by 34°, not good)

Examples °F → °C:

  • 40° F → 10/2 → 5° C (almost right)
  • 80° F → 50/2 → 25° C (low by about 2°)
  • ° F → 90/2 → 45° C (low by about 4°)
  • ° F → /2 → ° C (low by about 22°, not good)

 

temperature particles

Footnote: Temperature is a measure of how fast an object's particles are moving.

 

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Interactive ThermometerMetric - Imperial Conversion ChartsHow to Convert Imperial to MetricHow to Convert Metric to ImperialUnit ConverterMeasurement Index

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10 c to f

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