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Temperature,
in proportion.
Compare defined thermal reference points and representative physical temperatures on an absolute scale.
Temperature differences are meaningful, but ratios in Celsius or Fahrenheit are not. The comparison uses kelvins when an absolute scale is required.
- Entities
- 31
- Most common primary scale
- Temperature
- Common measurements
- Temperature, Normal boiling temperature, Sublimation temperature at one atmosphere, Defined interior temperature, Equilibrium melting temperature near 101 kPa, Representative boiling temperature
Within this category's most common primary scale, explore Absolute zero at 0 K and Fusion plasma at 100,000,000 K. These are navigation anchors, not universal category limits.
31 entities in this category, ordered by name.
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31 measured entities
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A 39 °C reading39 °CA fever is a temporary rise in body temperature, commonly associated with the immune system responding to infection or inflammation.A freezing winter day-10 °CA freezing winter day is weather cold enough for outdoor water to turn to ice.A warm summer day30 °CA warm summer day is weather with outdoor air noticeably hotter than average, typical of summer in temperate regions.Absolute zero0 KAbsolute zero is the lowest temperature permitted by thermodynamics, where a system has the least thermal energy available to it.Argon normal boiling point87.3 KArgon normal boiling point is the temperature at which argon transitions from liquid to gas under standard atmospheric pressure.Boiling helium4.22 KBoiling helium is helium in its liquid state at its normal boiling point under standard atmospheric pressure.Boiling nitrogen77.36 KBoiling nitrogen is nitrogen gas produced when liquid nitrogen is heated at normal atmospheric pressure.Boiling water100 °CBoiling water is water heated until it changes rapidly from liquid to steam at standard atmospheric pressure.
Cosmic microwave background2.725 KThe cosmic microwave background is faint thermal radiation filling the universe, left over from the early stages after the Big Bang.Dry ice sublimation point-78.5 °CThe dry ice sublimation point is the temperature at which solid carbon dioxide turns directly into gas at standard atmospheric pressure.Food refrigerator interior4 °CFood refrigerator interior refers to the air temperature inside a fridge, maintained to keep food safe and slow spoilage.Freezing water0 °CFreezing water is liquid water at the temperature where it begins to turn into ice under normal pressure.Fusion plasma100,000,000 KFusion plasma is a state of matter where atomic nuclei and electrons are separated and nuclei can undergo nuclear fusion.Gallium melting plateau at standard pressure29.76 °CThis is the temperature at which pure gallium changes from solid to liquid under normal atmospheric pressure.Hot oven200 °CA hot oven is a kitchen appliance used for baking or roasting food at elevated temperatures.Human body temperature37 °CHuman body temperature is the internal temperature maintained by a healthy person under normal conditions.Hydrogen normal boiling point20.27 KHydrogen normal boiling point is the temperature at which hydrogen changes from a liquid to a gas at standard atmospheric pressure.Lava1,373 KLava is molten rock that erupts from a volcano and flows on the Earth's surface before cooling and solidifying.Liquid ammonia boiling point-33.15 °CLiquid ammonia boiling point is the temperature at which ammonia boils and turns into gas near atmospheric pressure.Liquid methane boiling point-161.1 °CLiquid methane boiling point is the temperature at which methane changes from liquid to gas near atmospheric pressure.Molten iron1,811 KMolten iron is iron in its liquid state, formed by heating solid iron above its melting point.Neon normal boiling point27.1 KNeon normal boiling point is the temperature at which neon transitions from liquid to gas under standard atmospheric pressure.Neutron star surface1,000,000 KNeutron star surface temperature is the intense heat found at the outer layer of a young neutron star after a supernova.Nitrogen triple point63.15 KThe nitrogen triple point is the unique temperature and pressure at which nitrogen can coexist as a solid, liquid, and gas.Oxygen normal boiling point90.19 KOxygen normal boiling point is the temperature at which oxygen changes from liquid to gas at standard atmospheric pressure.Room temperature20 °CRoom temperature describes indoor air conditions generally considered comfortable for people and suitable for ordinary activities.Space Shuttle re-entry plasma8,000 KSpace Shuttle re-entry plasma is the extremely hot, ionised gas layer that forms around a spacecraft as it re-enters Earth's atmosphere at high speed.Superfluid helium lambda point2.17 KThe superfluid helium lambda point is the temperature at which helium-4 transitions from a normal liquid to a superfluid state.Ultracold atom cloud1 × 10⁻⁷ KAn ultracold atom cloud is a collection of atoms cooled to temperatures near absolute zero, used in advanced physics experiments.Water 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.Wood fire1,073 KA wood fire is the burning of wood in air, producing heat, light and flames.