Specific Latent Heat?

Question

What is it?............

How is it worked out?..................

Merci

Answer 1

There are two kinds of specific latent heat: Specific Latent heat of vaporization and Specificlatent heat of fusion.

Specific Latent Heat is the amount of energy you should give 1 kg of a certain substance to change it from one phase to another (ex: ice to water). While the body does not increase in temperature, you can consider it as a hidden amount of energy that you should give in.

For example, water is present at 0 C but a certain energy should be taken for each kilogram of water so that it totally becomes ice, or becomes steam if more energy is given.

Answer 2

The specific latent heat of a material tells you how much energy is needed to boil or melt 1kg of that material.  It is different for different materials.  If you want to melt a 1kg block of ice you need to add 330,000J of energy.  So the specific latent heat of ice is 330,000J/kg.  The energy needed to change the state of a solid, liquid or gas is calculated with this formula:

E=ml

E=heat energy added (j)

m=mass (kg)

l= specific latent heat (J/kg)

E.g. how much energy is needed to melt a single 0.02kg ice cube?

E=ml

E= 0.02x330,000=6,600J

E=6.6KJ

Answer 3

Latent heat is heat that is used to change matter from one state to another withoun changing the temperature.

Answer 4

specific latent heat is the amount of heat to change one kilogram of a substance from one state to another without a change in temperature...

if it is only latent heat, then it isthe amount of heat to change a substance from one state to another without a change in temperature...

so it's like from ice to water without a change in temperature... or water to water vapour without a change in temperature...

here's a link of the graph...

http://www.sei.ie/uploadedfiles/Educatio...

or

http://www.sei.ie/index.asp?locID=502&do...

hope this helps...