# Rate of vaporisation

## Homework Statement

During exercise the body loses 240 W of heat due to the evaporation of sweat. Assuming that the latent heat of at body temprature is 2255 kJ/kg, determine the rate of vaporisation of sweat.

L=Q/m

## The Attempt at a Solution

What formula do I need to use here? The only formula I can think of is the one with latent heat and heat energy Q=mL. But this formula only gives mass and doesn't give the rate of vaporisation!

ideasrule
Homework Helper
If 240J is added to the sweat per second and it takes 2255 000 J to vaporize one kg of sweat, how much is vaporized per second? You don't need any formulas, just logic.

If 240J is added to the sweat per second and it takes 2255 000 J to vaporize one kg of sweat, how much is vaporized per second? You don't need any formulas, just logic.

I'm not quite sure if I understand correctly, do you mean sweat+240J/2255000?

And it is 240 W not Joules...

And it is 240 W not Joules...

a Watt is just a Joule per second.