enthalpy
/ˈɛnθ(ə)lpi
/ /ɛnˈθalpi /noun Physics
1A thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume. (Symbol: H) Thermogram transition temperatures, enthalpies, and widths at half-height were determined using the software provided with the calorimeter....
- The internal energy of a system, like the enthalpy, is a state property, so it is fixed when the state of the system is specified.
- Scanning calorimetry is used as a direct method to reveal the thermodynamic properties of phase transition like transition temperatures and enthalpies.
1.1The change in enthalpy associated with a particular chemical process: most compounds have negative enthalpies of formation...
- In addition, melting requires significant amounts of extra heat, (in thermodynamic terms, the enthalpy of fusion), to break molecular bonds and cause a phase transition from solid to liquid.
- The enthalpy, entropy, and free energy changes in the opening reaction of each basepair are determined from the temperature dependence of the exchange rates.
- First, the volume change and the enthalpy change of the protein can be determined in time domain without temperature variation or solvent variation method.
Origin
1920s: from Greek enthalpein 'warm in', from en- 'within' + thalpein 'to heat'.
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