Calculating Rate of Vaporisation: 240 W Body Heat Loss

[roam]

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.

answer = 106 mg/s

Homework Equations

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]

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.

 

[roam]

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?

 

[roam]

And it is 240 W not Joules...

 

[willem2]

And it is 240 W not Joules...

a Watt is just a Joule per second.