Q:
# What Is the Formula for Heat of Vaporization?

**The heat of vaporization formula is q = m x ?Hv, where "q" is heat energy, "m" is mass and "?Hv" is heat of vaporization.** This represents the energy needed to heat a liquid into a gaseous state.

For example, the heat energy needed to turn 25 grams of water into steam (gaseous state) is: 25 grams x 2257 Joules/gram or 56425 Joules. The 2257 J/g is a predetermined value for heat of vaporization of water.

A practical application of the heat of vaporization is when a drop of methylated spirit put onto the hand evaporates. The hand feels cold because it provides the energy needed for the volatile liquid molecules to break free into gas.

Learn more about Thermodynamics-
Q:
## What Does Kinetic Energy Depend On?

A: Kinetic energy is dependent on the object's mass and velocity. Since kinetic energy is the energy of motion, all objects that have motion have potential ki... Full Answer >Filed Under: -
Q:
## How Is Thermal Conductivity Calculated?

A: The formula for calculating thermal conductivity is heat multiplied by the distance divided by the product of surface area times the temperature gradient. ... Full Answer >Filed Under: -
Q:
## How Do You Use Heat Transfer Equations?

A: The formula for heat transfer, Q=Cm?t, provides the amount of heat transferred (Q) by plugging in the relevant numbers. "C" stands for the specific heat va... Full Answer >Filed Under: -
Q:
## What Is the Latent Heat Formula?

A: The formula for specific latent heat is the amount of energy released or formed divided by the mass. The formula is notated as L = Q/m, where L is the late... Full Answer >Filed Under: