Standard conditions: what to write for enthalpy measurements
Dr Lavan Ganeshkumar, PhD · updated 4 October 2026
Standard conditions for enthalpy measurements are a pressure of 100 kPa and a stated temperature, usually 298 K, with every substance in its standard state.
Words that must appear
- 100 kPa
- A stated temperature
- Standard state
The sign
There is no sign, but a standard enthalpy change carries the standard symbol and the temperature it was measured at.
Do not confuse with
Room conditions. Standard conditions have a fixed pressure and a stated temperature.
Common questions
What are standard conditions in chemistry?
A pressure of 100 kPa and a stated temperature, usually 298 K, with substances in their standard states.
What is the standard temperature for enthalpy changes?
Usually 298 K, but it must be stated.
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