Latent heat due to the moisture in air can be calculated in SI-units as: h l = ρ h we q dw kg (2) where . Latent heat can be measured from a heating or cooling curve line graph. The formula for Latent heat of fusion: If m kg of the solid changes into the liquid at a constant temperature which is its melting point. - Total Heat (BTU/hr) = 4.5 x cfm x ∆h (std. h l = latent heat (kW) ρ = density of air (1.202 kg/m 3) q = air volume flow (m 3 /s) h we = latent heat evaporization water (2454 kJ/kg - in air at atmospheric pressure and 20 o C) Latent Heat Definition: (Change of State) The heat energy absorbed or released at constant temperature per unit mass for change of state is called latent heat. Then the heat absorbed by it means the latent heat of fusion formula will be, Q = … specific latent heat of fusion = 334 kJ/kg (from the table above) specific latent heat of fusion = 334 × 1,000 = 334,000 J/kg. By using the formula, Given that Mass (M) = 10 kg, Amount of heat (Q) = Let us calculate latent heat by a simple expression: Determine the latent heat of a 10kg substance if the amount of heat for a phase change is Latent heat is energy released or absorbed, by a body during a constant-temperature process, for example, a phase change of water from liquid to gas. Latent Heat. Latent heat of fusion of water: That is 334kJ/kg. Thus, the latent heat of fusion encompasses the process of adding heat to melt some solid. air) - Sensible Heat (BTU/hr) = 1.1 x cfm x ∆t - Latent Heat (BTU/hr) = 0.69 x cfm x ∆gr. Latent heat is defined as the amount of heat required to change the state of unit mass of substance without change in temperature. We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts. Latent Heat | Definition, Formula, Units – Thermometry and Calorimetry Latent heat of vaporization of water: That is 2264.705kJ/kg.