How hot is a 'moderate' oven? About 350 degrees F or 175 degrees C! Use this handy chart to convert temperatures from Fahrenheit to Celsius. How hot is a 'moderate' oven? About 350 degrees F or 175 degrees C! Use this handy chart to convert temperatures from Fahrenheit to Celsius. F° to C°: Fahrenheit to Celsius Conversion Formula. To convert temperatures in degrees Fahrenheit to Celsius, subtract 32 and multiply by.5556 (or 5/9).

Celsius

Although initially defined by the freezing point of water (and later the melting point of ice), the Celsius scale is now officially a derived scale, defined in relation to the Kelvin temperature scale.

Zero on the Celsius scale (0℃) is now defined as the equivalent to 273.15K, with a temperature difference of 1 deg C equivalent to a difference of 1K, meaning the unit size in each scale is the same. This means that 100℃, previously defined as the boiling point of water, is now defined as the equivalent to 373.15K.

The Celsius scale is an interval system but not a ratio system, meaning it follows a relative scale but not an absolute scale. This can be seen because the temperature interval between 20℃ and 30℃ is the same as between 30℃ and 40℃, but 40℃ does not have twice the air heat energy of 20℃.

A temperature difference of 1 deg C is the equivalent of a temperature difference 1.8°F.

Fahrenheit

Fahrenheit is a thermodynamic temperature scale, where the freezing point of water is 32 degrees Fahrenheit (℉) and the boiling point 212℉ (at standard atmospheric pressure). This puts the boiling and freezing points of water exactly 180 degrees apart. Therefore, a degree on the Fahrenheit scale is 1/180 of the interval between the freezing point and the boiling point of water. Absolute zero is defined as -459.67℉.

A temperature difference of 1℉ is the equivalent of a temperature difference 0.556℃.

Kelvin

Based upon the definitions of the Centigrade scale and the experimental evidence that absolute zero is -273.15ºC

Introduction to temperature - including Celsius, Fahrenheit, Kelvin and Rankine definitions - an online temperature converter

Temperature (sometimes called thermodynamic temperature) is a measure of the average kinetic energy of the particles in a system. Temperature is the degree of 'hotness' ( or 'coldness') - a measure of the heat intensity. The most common symbol or abbreviation for temperature is T.

When two objects of different temperatures are in contact - the warmer object becomes colder while the colder object becomes warmer. This means that heat flows from the warmer to the colder object.

Temperature Converter

Convert between °C (Celsius), °F (Fahrenheit),K (Kelvin) and°R (Rankine) with the calculator below:

Temperature Converter - Web App

Add the Temperature Converter Web App to your mobile device or desktop. The App is saved in your browser and works offline automatically after first visit.

Degree Celsius (°C) and Degree Fahrenheit (°F)

A thermometer can help us determine how cold or hot a substance is. Temperature is in most of the world measured and reported in degrees Celsius (°C). In the U.S. it is common to report temperature in degrees Fahrenheit (°F). In the Celsius and Fahrenheit scales the temperatures where ice melts (water freezes) and water boils are used as reference points.

• In the Celsius scale the freezing point of water is defined as 0 °C and the boiling point is defined as 100 °C
• In the Fahrenheit scale the water freezes at 32 °F and boils at 212 °F

In the Celsius scale there are 100 degrees between the freezing point and the boiling point of water compared to 180 degrees in the Fahrenheit scale. This means that 1 °C = 1.8 °F (check the section about temperature differences below).

Values can be converted between the two temperature units by using the equations:

T(°F) = 1.8 T(°C) + 32 (1)

T(°C) = (T(°F) - 32)/1.8 (2)

where

T(°C)= temperature (°C )

T(°F)= temperature (°F)

Celsius vs. Fahrenheit

Example: A patient with SARS (Severe Acute Respiratory Syndrome) has a temperature of 106 °F. What is the temperature in Celsius?

T(°C) = (106 °F - 32)/1.8 = 41.1^oC

Temperature Conversion Table - ^oC vs °F

Temperature Difference - or Temperature Change - degree Celsius versus degree Fahrenheit

Note that for temperature difference (change) - as used in heat loss diagrams

• 1 degree Celsius of temperature differenceequals 1.8 degree Fahrenheit of temperature difference

ΔT(°C) = ΔT(°F) / 1.8(3)

ΔT(°F) = 1.8 ΔT(°C) (4)

where

ΔT(°F) = temperature difference (°F)

ΔT(°C) = temperature difference (°C)

Example: Water is cooled from 100°C to 60°C. What is the temperature difference in °F?

Temperature difference in degrees Celsius:

ΔT(°C) = 100 °C - 60 °C = 40 C°

Note that °C is used for actual temperatures (temperature relative to 273.15 K) and C° is used for temperature differences.

Temperature difference in degrees Fahrenheit calculated by using (1)

100 °C= 1.8 (100 °C) + 32 = 212 °F

60 °C = 1.8 (60 °C) + 32 = 140 °F

ΔT(°F) = 212°F - 140°F = 72 °F

Temperature difference in degrees Fahrenheit calculated by using (3)

ΔT(°F) = 1.8 (40 C°) = 72 °F

Temperature Difference Converter

Temperature Conversion Charts

Temperature Difference

C°°F

Kelvin - K

Another scale (common in science) is Kelvin, or the Absolute Temperature Scale. On the Kelvin scale the coldest temperature possible, -273 °C, has a value of 0 Kelvin (0 K) and is called the absolute zero. Units on the Kelvin scale are called Kelvins (K) and no degree symbol is used.
Because there are no lower temperatures than 0 K - the Kelvin scale does not have negative numbers.

The Kelvin has the same incremental scale as the Celsius scale and one unit Kelvin is equal in size to one unit Celsius:

1 unit Kelvin = 1 unit °C

ΔT(°K) = ΔT(°C) (5)

To calculate a Kelvin temperature, add 273 to the Celsius temperature:

T(K) = T(°C) + 273.15 (6)

Temperature Conversion Worksheet

Example: What is the normal body temperature of 37 ^oC in the Kelvin scale?

Body Temperature Conversion Calculator

T(K) = T(°C) + 273.15 = 37°C + 273.15 = 310.15 K

Degree Rankine - R

Conversion Chart Celsius To Fahrenheit

In the English system the absolute temperature is in degrees Rankine (R), not in Fahrenheit:

T(°R) = 1.8*T(K) (7)

T(°R) = 1.8*(T(°C)+273.15)

T(°R) = T(°F) + 459.67 (8)

ΔT(°R) = ΔT(°F) (9)

Celcius to Fahrenheit Converter (and vice versa)

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• Basics - The SI-system, unit converters, physical constants, drawing scales and more
• Temperature Measurement - Measurement of temperature - probes, sensors and transmitters
• Thermodynamics - Effects of work, heat and energy on systems

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