Ultracold atom cloud
An ultracold atom cloud is a collection of atoms cooled to temperatures near absolute zero, used in advanced physics experiments.
How big is it?
1 × 10⁻⁷ K
Also -459.7 °F
Temperature · defined reference
A little perspective
Ultracold atom cloud is 1 × 10⁻⁷ K warmer than Absolute zero.
Absolute zero: Absolute zero is the lowest temperature permitted by thermodynamics, where a system has the least thermal energy available to it.
Measurements, assumptions & sources +
Ultracold atom cloud
A chosen 100 nK laboratory-temperature scale. It is a model, not a current cooling record.
Defined examples — our methodology
The marked temperature is calibrated. Unmeasured illustration details are representative.
Absolute zero
The zero of the thermodynamic kelvin scale. It is approached in experiments, not reached by ordinary finite cooling.
NIST — 2022 CODATA fundamental constants
The marked temperature is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 1 × 10⁻⁷ K
For comparison, this page uses temperature. This is labelled defined reference: an explicit comparison model rather than a claim that every example has the same value.
A chosen 100 nK laboratory-temperature scale. It is a model, not a current cooling record.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
Ultracold atom cloud dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 1 × 10⁻⁷ K | Not recorded | defined reference |
Around this scale
Go smaller. Go bigger.
These links use compatible temperature records, ordered around the selected value.
Nearest lower value · TemperatureAbsolute zero0 KAbsolute zero is the lowest temperature permitted by thermodynamics, where a system has the least thermal energy available to it.
Around the same scale · TemperatureCosmic microwave background2.725 KThe cosmic microwave background is faint thermal radiation filling the universe, left over from the early stages after the Big Bang.Nearest higher value · TemperatureSuperfluid 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.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
There’s always another scale
Follow your curiosity.
TemperatureAbsolute zero0 KAbsolute zero is the lowest temperature permitted by thermodynamics, where a system has the least thermal energy available to it.TemperatureRoom temperature20 °CRoom temperature describes indoor air conditions generally considered comfortable for people and suitable for ordinary activities.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.
Fundamental physicsPlanck temperature1.417 × 10³² KThe Planck temperature is a theoretical temperature scale at which quantum gravitational effects are expected to become important.TemperatureCosmic microwave background2.725 KThe cosmic microwave background is faint thermal radiation filling the universe, left over from the early stages after the Big Bang.TemperatureBoiling helium4.22 KBoiling helium is helium in its liquid state at its normal boiling point under standard atmospheric pressure.TemperatureSuperfluid 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.TemperatureHydrogen 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.