Standard enthalpy change of atomisation
Enthalpy change when one mole of gaseous atoms is formed from an element in its standard state under standard conditions
Standard enthalpy change of neutralisation
Enthalpy change when solutions of acid and alkali react together under standard conditions to produce one mole of water
Standard enthalpy change or reaction
Enthalpy change when quantities of substances in standard states react completely under standard conditions
Standard enthalpy of combustion
Enthalpy change when one mole of a substance is burned in completely in oxygen under standard conditions
Standard enthalpy of formation
Enthalpy change when one mole of a substance is produced from its elements under standard conditions