How Much Sweat Evaporates to Cool a 80kg Man by 1°C?

Click For Summary
SUMMARY

The discussion focuses on calculating the mass of sweat required to cool an 80 kg man by 1°C through evaporation. The heat of evaporation of water at body temperature (37°C) is established as 2400 J/g. Using the formula Q = Lm, where Q is the heat lost, L is the latent heat of evaporation, and m is the mass of sweat, participants aim to derive the necessary mass of sweat for the temperature decrease. The solution involves applying the equation c = ∆Q ÷ m∆T to find the mass of water evaporated.

PREREQUISITES
  • Understanding of thermodynamics, specifically heat transfer.
  • Familiarity with the concept of latent heat of evaporation.
  • Basic algebra for manipulating equations.
  • Knowledge of specific heat capacity and its application in temperature change calculations.
NEXT STEPS
  • Study the principles of heat transfer in thermodynamics.
  • Learn about latent heat and its significance in phase changes.
  • Explore specific heat capacity calculations and their applications.
  • Practice solving problems involving mass, heat, and temperature changes using relevant equations.
USEFUL FOR

Students in physics or engineering, educators teaching thermodynamics, and anyone interested in the physiological aspects of human cooling mechanisms through sweat evaporation.

FFFUUU
Messages
2
Reaction score
0

Homework Statement



How large is the mass of sweat (water) evaporated by a man with 80 kg body weight assuming that his body
temperature decreased due to the evaporation by 1 °C? (Assume, that the human body consists mostly of water
and the heat of evaporation of water at body temperature (37 °C) is around 2400 J/g) (14 dkg)

Homework Equations



Q = Lm

c = ∆Q ÷ m∆T

The Attempt at a Solution



Many, so far. But I have no idea which variable for mass to use in which equation. I have almost no time left and need help quickly! The best would be a step-through-step.
 
Physics news on Phys.org
Anyone?
 

Similar threads

Question about Phase Change & Latent Heat
  • · Replies 13 ·
Replies
13
Views
3K
How Does Latent Heat Affect Sweat Evaporation in Cooling the Body?
  • · Replies 3 ·
Replies
3
Views
5K
How much ice to cool down this water?
  • · Replies 17 ·
Replies
17
Views
6K
High School How does sweating cool a person down?
  • · Replies 9 ·
Replies
9
Views
15K
Why Does Liquid Cool During Evaporation?
  • · Replies 3 ·
Replies
3
Views
6K
How much water evaporates per minute from a copper pot on a stove?
  • · Replies 4 ·
Replies
4
Views
2K
Calculate the Mass of Ice cubes needed to cool a soft drink
  • · Replies 10 ·
Replies
10
Views
4K
Thermodynamics - Hypothermia - Heat loss
  • · Replies 12 ·
Replies
12
Views
2K
How Much Water Can a 1KW Carnot Engine Freeze in 5 Minutes?
  • · Replies 3 ·
Replies
3
Views
2K
Fraction within a fraction -- Units
  • · Replies 3 ·
Replies
3
Views
3K