Finding how much heat released by evaporation of water

Click For Summary
The discussion centers on understanding the heat dynamics involved in the evaporation of water, particularly in relation to a specific figure of 120W. Participants clarify that evaporation itself does not release heat; instead, it requires energy absorption. The heat in question is derived from the human body, which provides the energy needed for water to evaporate. This exchange is crucial for understanding the cooling effect of evaporation. Overall, the conversation emphasizes the importance of energy absorption in the evaporation process.
member 731016
Homework Statement
Please see below
Relevant Equations
Please see below
For this,
1680591180620.png

Dose anybody please know where they got the 120W from?

Many thanks!
 
Last edited by a moderator:
Physics news on Phys.org
There must be more context to the question.
 
Reply
  • Like
Likes member 731016
haruspex said:
There must be more context to the question.
Thank you for your reply @haruspex!

I'm very sorry, but somehow, I missed the slide before. I think I understand where they got the 120W from now.

Thank you for your help!
 
What releases the heat? The water needs to absorb energy in order to evaporate. Evaporation does not release heat.
 
Reply
  • Like
Likes hutchphd, member 731016 and Lnewqban
nasu said:
What releases the heat? The water needs to absorb energy in order to evaporate. Evaporation does not release heat.
Thank you for your reply @nasu!

The question was about the heat released from the human body I recall. So I think the water absorbs the heat from the human.

Many thanks!
 

Thread 'Bernoulli vs real life experiment'

If have close pipe system with water inside pressurized at P1= 200 000Pa absolute, density 1000kg/m3, wider pipe diameter=2cm, contraction pipe diameter=1.49cm, that is contraction area ratio A1/A2=1.8 a) If water is stationary(pump OFF) and if I drill a hole anywhere at pipe, water will leak out, because pressure(200kPa) inside is higher than atmospheric pressure (101 325Pa). b)If I turn on pump and water start flowing with with v1=10m/s in A1 wider section, from Bernoulli equation I...
View full post »

Similar threads

Energy Required to Evaporate Water
  • · Replies 23 ·
Replies
23
Views
3K
Deriving general specific heat capacity formula
  • · Replies 8 ·
Replies
8
Views
2K
How does soap water membrane thickness affect surface tension?
  • · Replies 2 ·
Replies
2
Views
2K
B Cooling effect of evaporation occurs even if the surroundings are colder?
  • · Replies 10 ·
Replies
10
Views
2K
I Heat pumps: Questions about compressor pump refrigerant gas and evaporator
  • · Replies 30 ·
2
Replies
30
Views
3K
How much water evaporates per minute from a copper pot on a stove?
  • · Replies 4 ·
Replies
4
Views
1K
How much time does it take to warm up water?
  • · Replies 15 ·
Replies
15
Views
2K
Box with a jumper/blanket on top, cooling or heating?
  • · Replies 3 ·
Replies
3
Views
1K
Do you need to account for the water heating up to the boiling point?
  • · Replies 23 ·
Replies
23
Views
2K
Cylinder in a heat bath @ 0C contains water and ice & is compressed
  • · Replies 19 ·
Replies
19
Views
2K