25 degrees Celsius
25 °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 25 degrees Celsius?
Everyday temperatures
25 °C
25 degrees Celsius
Celsius and Fahrenheit have shifted zero points.
25 °CTemperature
0 K · absolute zero
Gallium melting plateau at standard pressure
This is the temperature at which pure gallium changes from solid to liquid under normal atmospheric pressure.
29.76 °CEquilibrium melting temperature near 101 kPa
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
25 degrees Celsius is 4.765 K lower than the equilibrium melting temperature near 101 kPa of the melting plateau of gallium at standard pressure.
Measurements, assumptions & sources +
25 degrees Celsius
Temperature: 25 °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.
Gallium melting plateau at standard pressure
Equilibrium melting temperature near 101 kPa: 29.76 °C; specified; range 29.75 °C–29.77 °C.
Gallium melts at about 302.9146 K (29.7646 °C) near standard pressure. Purity and pressure affect a realised plateau.
The marked equilibrium melting temperature near 101 kPa is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 25 degrees Celsius with the equilibrium melting temperature near 101 kPa of the melting plateau of gallium at standard pressure. The notes below explain how each value was chosen.
Gallium melting plateau at standard pressure
29.76 °CEquilibrium melting temperature near 101 kPa · specified · range 29.75 °C–29.77 °C
Gallium melts at about 302.9146 K (29.7646 °C) near standard pressure. Purity and pressure affect a realised plateau.
- Comparing
- Temperature ↔ Equilibrium melting temperature near 101 kPa
- 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.
- We use 29.76 °C for the equilibrium melting temperature near 101 kPa of the melting plateau of gallium at standard pressure; the recorded range is 29.75 °C–29.77 °C.
Compare temperature differences in kelvins; Celsius and Fahrenheit ratios are not meaningful.
77 °Fdegrees Fahrenheit
298.15 Kkelvin
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