Temperature
A short introduction to temperature - including Celsius, Fahrenheit, Kelvin and Rankine definitions - online temperature converter
Sponsored Links
Temperature (sometimes called thermodynamic temperature) is a measure of the average kinetic energy of a systems particles. Temperature is the degree of "hotness" ( or "coldness"), a measure of the heat intensity.
When two objects of different temperatures are in contact, the warmer object becomes colder while the colder object becomes warmer. It means that heat flows from the warmer object to the colder one.
Temperature Units Online Converter
Convert between oC (Celcius), oF (Fahrenheit), K (Kelvin) and oR (Rankine) with the calculator below:
Degree Celsius (oC) and Degree Fahrenheit (oF)
A thermometer can help us determine how cold or how hot a substance is. Temperatures in science (and in most of the world) are measured and reported in degrees Celsius (oC). In the U.S., it is common to report temperature in degrees Fahrenheit (oF). On both the Celsius and Fahrenheit scales the temperature at which ice melts (water freezes) and the temperature at which water boils, are used as reference points.
- On the Celsius scale, the freezing point of water is defined as 0 oC, and the boiling point of water is defined as 100 oC.
- On the Fahrenheit scale, the water freezes at 32 oF and the water boils at 212 oF.
On the Celsius scale there are 100 degrees between freezing point and boiling point of water, compared to 180 degrees on the Fahrenheit scale. This means that 1 oC = 1.8 oF.
Thus the following formulas can be used to convert temperature between the two scales:
tF = 1.8 tC + 32 = 9/5 tC + 32 (1)
tC = 0.56 (tF - 32) = 5/9 (tF - 32) (2)
where
tC = temperature (oC)
tF = temperature (oF)
Degree Celsius and degree Fahrenheit are compared in the table below:
| Temperature | |
| oC | oF |
| -20 | -4 |
| -15 | 5 |
| -10 | 14 |
| -5 | 23 |
| 0 | 32 |
| 5 | 41 |
| 10 | 50 |
| 15 | 59 |
| 20 | 68 |
| 25 | 77 |
| 30 | 86 |
| 35 | 95 |
| 40 | 104 |
| 45 | 113 |
| 50 | 122 |
Example - A patient with SARS (Severe Acute Respiratory Syndrome) has a temperature of 106 oF. What does this read on a Celsius thermometer?
tC = 5/9 (106 - 32) = 41.1 oC
Kelvin - K
Another scale (common in science) is Kelvin, or the Absolute Temperature Scale. On the Kelvin scale the coldest temperature possible, -273 oC, 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.
A Kelvin equal in size to a Celsius unit:
1 K = 1 oC
To calculate a Kelvin temperature, add 273 to the Celsius temperature:
tK = tC + 273.16 (3)
Example - What is the normal body temperature of 37 oC in the Kelvin scale?
tK = tC + 273.16 = 37 + 273.16
= 310.16 K
Degree Rankine - R
In the English system the absolute temperature is in degrees Rankine (R), not in Fahrenheit:
tR = tF + 459.67 (4)
Sponsored Links
Related Topics
- Basics - Basic Information as SI-system, Unit converters, Physical constants...
- Temperature Measurement - Measurement of temperature - probes, sensors and transmitters
- Thermodynamics - The effects of work, heat and energy on a system
Sponsored Links
Related Documents
- Ideal Gas Law - In perfect or ideal gas the change in density is directly related to the change of temperature and pressure as expressed by the Ideal Gas Law
- International Standard Atmosphere - International standard atmosphere - ranging elevation -2000 to 30000 meters - pressure, temperature, density, viscosity, thermal conductivity and velocity of sound
- Temperature Sensors - Comparing Types - Comparing advantages and disadvantages of thermocouples, RTDs and thermistors temperature sensors
- The Individual and Universal Gas Constant - The Individual and Universal Gas Constant in fluid mechanics and thermodynamics
- Thermal Conductivity of Metals - Thermal conductivity of some common metals
