Planck temperature scale

The Planck temperature scale is an absolute temperature scale using natural units. On this scale, 0 is absolute zero, and 1 is the Planck temperature. Quantum Theory states that the Planck temperature is the hottest possible temperature. The symbol used for this scale is TP.[1] The freezing/melting point of water on this scale would be written 1.928 × 10−30TP.

Examples of different temperatures expressed in Planck units

| Planck (TP)  | Celsius (°C)  | Fahrenheit (°F)
Absolute zero  | 0  | -273.15  | -459.67
Cosmic microwave background | 1.923 × 10−32 | -270.4  | -454.8
Coldest temp on Earth, Vostok, Antarctica, 1983  | 1.298 × 10−30 | -89.2  | -128.6
Freezing/melting point of water | 1.928 × 10−30 | 0.0  | 32.0
Room temperature (approximate, can vary)  | 2.090 × 10−30 | 23.0  | 73.4
Average human body temperature[2] | 2.187 × 10−30 | 36.8  | 98.2
Hottest temp on Earth, Death Valley, United States and Mitribah, Kuwait[3] | 2.309 × 10−30 | 54.0  | 129.2
Boiling point of water  | 2.634 × 10−30 | 100.0  | 212.0
Core temperature of the Sun | 1.1 × 10−25 | 15,000,000  | 27,000,000
Planck temperature  | 1  | 1.417 × 1032 | 2.550 × 1032
This table illustrates how normal temperatures are extremely close to absolute zero in comparison to the Planck temperature.
Temperature conversion formulas

Celsius to Planck  | TP = (°C + 273.15) / (1.41683385 × 1032)
Planck to Celsius  | °C = TP × 1.41683385 × 1032 - 273.15
Fahrenheit to Planck  | TP = (°F + 459.67) / (2.55030092 × 1032)
Planck to Fahrenheit  | °F = TP × 2.55030092 × 1032 - 459.67
Kelvin to Planck  | TP = K / (1.41683385 × 1032)
Planck to Kelvin  | K = TP × 1.41683385 × 1032

## Expressing the Planck temperature scale in more convenient units

A way of expressing temperatures in more familiar sized units is to use centimicroyocto plank temperatures (cµyTP). The freezing point of water is 1.928 × 10−30TP. By simply moving the decimal point 32 places to the right, you can convert it to 192.8 cµyTP. These units are somewhat comparable to that of that of the Kelvin scale. When using cµyTP, 0 is absolute zero, and 1 × 1032 is the Planck temperature. 1 × 1032 cµyTP is a perfect base ten number as opposed to 1.417 × 1032 K, 1.417 × 1032 °C, or 2.550 × 1032 °F. Each centimicroyocto plank temperature is equal to one 100 nonillionth of the Planck temperature.

Examples of different temperatures expressed in centimicroyocto Planck Temperatures

| cµyTP | Celsius (°C)  | Fahrenheit (°F)
Absolute zero  | 0  | -273.15  | -459.67
Cosmic microwave background | 1.923  | -270.4  | -454.8
Coldest temp on Earth, Vostok, Antarctica, 1983  | 129.8  | -89.2  | -128.6
Freezing/melting point of water | 192.8  | 0.0  | 32.0
200 mark  | 200.0  | 10.2  | 50.4
Room temperature (approximate, can vary)  | 209.0  | 23.0  | 73.4
Average human body temperature[2] | 218.7  | 36.8  | 98.2
Hottest temp on Earth, Death Valley, United States and Mitribah, Kuwait[4] | 230.9  | 54.0  | 129.2
Boiling point of water  | 263.4  | 100.0  | 212.0
Core temperature of the Sun | 11,000,000  | 15,000,000  | 27,000,000
Planck temperature  | 1.0 × 1032 | 1.417 × 1032 | 2.550 × 1032

Temperature conversion formulas

Celsius to cµyTP | cµyTP = (°C + 273.15) / 1.41683385
cµyTP to Celsius  | °C = cµyTP × 1.41683385 - 273.15
Fahrenheit to cµyTP | cµyTP = (°F + 459.67) / 2.55030092
cµyTP to Fahrenheit  | °F = cµyTP × 2.55030092 - 459.67
Kelvin to cµyTP | cµyTP = K / 1.41683385
cµyTP to Kelvin  | K = cµyTP × 1.41683385

## References

1. ↑ "CODATA Value: Planck temperature". https://physics.nist.gov/cgi-bin/cuu/Value?plktmp.
2. ↑ 2.0 2.1 MacKowiak, Philip A. (1992). "A Critical Appraisal of 98.6°F, the Upper Limit of the Normal Body Temperature, and Other Legacies of Carl Reinhold August Wunderlich". JAMA: the Journal of the American Medical Association 268 (12): 1578–80. doi:10.1001/jama.1992.03490120092034. PMID 1302471.
3. ↑ "Hottest Reliably Measured Air Temperatures on Earth" (in en-US). Weather Underground - Christopher C. Burt. 2016-07-22. https://www.wunderground.com/blog/weatherhistorian/hottest-reliably-measured-air-temperatures-on-earth.html.
4. ↑ "Hottest Reliably Measured Air Temperatures on Earth" (in en-US). Weather Underground - Christopher C. Burt. 2016-07-22. https://www.wunderground.com/blog/weatherhistorian/hottest-reliably-measured-air-temperatures-on-earth.html.

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