The correct answer is temperature

 Key Points

• Latent heat is the energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process.
• Latent heat is defined as heat energy that is absorbed or released during the transition phase of a substance.
• It can be either the transition of gas to a liquid or a liquid to a solid.
• It is the heat required to convert a solid into a liquid or vapour, or a liquid into a vapour, without a change of temperature.
• Latent heat is related to a heat property called enthalpy.
• Latent heat is associated with the change of phase of atmospheric or ocean water, vaporization, condensation, freezing, or melting.

Important Points

• The term latent heat was introduced into calorimetry around 1750 by Joseph Black.
•  the latent heat for a given mass of a substance is calculated by Q = mL,
  • where, Q is the amount of energy released or absorbed during the change of phase of the substance (in kJ).
  • m is the mass of the substance (in kg).
  • L is the specific latent heat( either for fusion or vaporization) for a particular substance (kJ kg⁻¹).
• The SI unit for latent heat is J kg⁻¹.
• The dimensional formula is given by [M⁰ L² T^-2].

Additional Information