-100 degrees Celsius
-100 °CTemperature · definition
Celsius and Fahrenheit have shifted zero points. Differences are useful; “twice as hot” in °C or °F is not a physical temperature ratio.
Temperature
Just how hot is -100 degrees Celsius?
Below freezing
-100 °C
-100 degrees Celsius
Celsius and Fahrenheit have shifted zero points.
-100 °CTemperature
0 K · absolute zero
Dry ice sublimation point
The dry ice sublimation point is the temperature at which solid carbon dioxide turns directly into gas at standard atmospheric pressure.
-78.5 °CSublimation temperature at one atmosphere
0 K · absolute zero
Celsius and Fahrenheit zero points are offsets. Compare temperature differences, not ratios in °C or °F. The kelvin axis starts at absolute zero.
A little perspective
-100 degrees Celsius is 21.5 K lower than the dry ice sublimation point.
Measurements, assumptions & sources +
-100 degrees Celsius
Temperature: -100 °C; definition.
Celsius and Fahrenheit have shifted zero points. Differences are useful; “twice as hot” in °C or °F is not a physical temperature ratio.
Dry ice sublimation point
Sublimation temperature at one atmosphere: -78.5 °C; approximate.
Solid carbon dioxide sublimates near 194.65 K (−78.5 °C) at one atmosphere rather than melting. Pressure changes the phase boundary.
NIST Chemistry WebBook — Carbon dioxide
The marked sublimation temperature at one atmosphere is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare -100 degrees Celsius with the dry ice sublimation point. The notes below explain how each value was chosen.
Dry ice sublimation point
-78.5 °CSublimation temperature at one atmosphere · approximate
Solid carbon dioxide sublimates near 194.65 K (−78.5 °C) at one atmosphere rather than melting. Pressure changes the phase boundary.
- Comparing
- Temperature ↔ Sublimation temperature at one atmosphere
- Relative size
- We compare temperatures using a difference in kelvins, not a ratio.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The dry ice sublimation point: This is an estimate; check the notes for its rounding and uncertainty.
Compare temperature differences in kelvins; Celsius and Fahrenheit ratios are not meaningful.
-148 °Fdegrees Fahrenheit
173.15 Kkelvin
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