the.com/enthalpy
the universe's energy receipt, tallying heat you'll pay or pocket when matter rearranges itself
means In thermodynamics, the total heat content of a system at constant pressure—the internal energy plus the energy needed to make room for its volume—useful for tracking heat released or absorbed in reactions and phase changes.
from Coined in the early 20th century from Greek 'enthalpein,' meaning 'to warm in' or 'to put heat into' (from 'en-,' in, plus 'thalpein,' to heat). The Dutch physicist Heike Kamerlingh Onnes is often credited with introducing the term, building it deliberately on Greek so the word itself announces its job: heat, packed inside.
- hidden symbol
- Denoted H, possibly for heat or honoring physicist Heike Kamerlingh Onnes
- can't measure it
- Only changes in enthalpy are knowable, never absolute values
- explosions love it
- Negative enthalpy means energy released, fueling fire and detonations
- includes pressure
- It bundles internal energy plus pressure times volume together
- powers your fridge
- Enthalpy of vaporization lets refrigerants steal heat from food