# Specific latent heat

## What is Specific latent heat?

Specific latent heat is the energy needed to change the state of a substance. Latent heat is the energy absorbed or released by a substance during a change in its physical state. The latent heat is normally shown as the amount of heat energy in joules per Kg mass of the substance undergoing the change of state.

## Specific latent heat equation

To calculate Specific latent heat we write the equation like this.

$E = {\text{m} \text{L}}$

## Specific latent heat demo

In this tutorial you will learn how to calculate the energy needed for different substances to change their state of matter.

## Chilled practice question

The specific latent heat of water for melting is 334000 J/Kg. Find the energy needed to melt a 30 Kg block of ice.

## Frozen practice question

What is the specific latent heat of a material if 2 Kg of it gives out 95.5 KJ when it melts.

## Science in context

Specific latent heat is the energy needed to change the state of a substance.

## Have you entered Millies monthly giveaway?

Check out Millies page to find out how to win a prize or check out the shop to buy Fridge Physics merch.

### Millies Merch Giveaway

Please register to view this content.

### Merch

Fridge Physics has baseball caps, woollen beanies, hoodies and polo shirts in various colours and sizes. Free delivery anywhere in the UK.
Scroll to Top