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.
Also known as: dry ice temperature, carbon dioxide sublimation point
How big is it?
-78.5 °C
Also -109.3 °F
Sublimation temperature at one atmosphere · approximate
A little perspective
Dry ice sublimation point is 78.51 K cooler than Water triple point.
Water triple point: The water triple point is the unique temperature and pressure at which water can exist simultaneously as solid, liquid, and vapour in equilibrium.
Measurements, assumptions & sources +
Dry ice sublimation point
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.
Water triple point
The triple point of water is 273.16 K for a specified isotopic composition at its equilibrium pressure. It is distinct from ordinary freezing water at atmospheric pressure.
IAPWS — Fundamental physical constants of water
The marked triple-point temperature is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use -78.5 °C
For comparison, this page uses sublimation temperature at one atmosphere. This is labelled approximate; the central value is useful for comparison, while real values or measurement solutions can vary.
Solid carbon dioxide sublimates near 194.65 K (−78.5 °C) at one atmosphere rather than melting. Pressure changes the phase boundary.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
Dry ice sublimation point dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| -78.5 °C | Not recorded | approximate |
Around this scale
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These links use compatible temperature records, ordered around the selected value.
Nearest lower value · TemperatureLiquid methane boiling point-161.1 °CLiquid methane boiling point is the temperature at which methane changes from liquid to gas near atmospheric pressure.Around the same scale · TemperatureLiquid ammonia boiling point-33.15 °CLiquid ammonia boiling point is the temperature at which ammonia boils and turns into gas near atmospheric pressure.Nearest higher value · TemperatureFreezing water0 °CFreezing water is liquid water at the temperature where it begins to turn into ice under normal pressure.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- NIST Chemistry WebBook — Carbon dioxideCarbon-dioxide phase data and sublimation temperature.
There’s always another scale
Follow your curiosity.
TemperatureBoiling nitrogen77.36 KBoiling nitrogen is nitrogen gas produced when liquid nitrogen is heated at normal atmospheric pressure.TemperatureFreezing water0 °CFreezing water is liquid water at the temperature where it begins to turn into ice under normal pressure.TemperatureWater triple point0.01 °CThe water triple point is the unique temperature and pressure at which water can exist simultaneously as solid, liquid, and vapour in equilibrium.TemperatureA freezing winter day-10 °CA freezing winter day is weather cold enough for outdoor water to turn to ice.TemperatureGallium melting plateau at standard pressure29.76 °CThis is the temperature at which pure gallium changes from solid to liquid under normal atmospheric pressure.TemperatureRoom temperature20 °CRoom temperature describes indoor air conditions generally considered comfortable for people and suitable for ordinary activities.TemperatureA warm summer day30 °CA warm summer day is weather with outdoor air noticeably hotter than average, typical of summer in temperate regions.TemperatureHuman body temperature37 °CHuman body temperature is the internal temperature maintained by a healthy person under normal conditions.