Questions tagged [cooling]
208 questions
12
votes
3 answers
Why does splitting hot tea from one glass in two glasses makes it cool faster?
For a while now I've noticed that if I take a cup of hot tea and pour it into two cups and leave it then both cups will cool faster than the single cup.
How is it that nature cools two cups of tea in parallel more quickly? It's still the same amount…
bodacydo
- 1,313
2
votes
1 answer
Is my modification of Newtons Law of Cooling an infraction?
I'm working on temperature prediction and therefore also cooling. I stumbled upon Newton's Law of Cooling (NLC) and I do like its simplicity, but I'm not so happy about the condition that the surrounding temperature must be constant.
Original…
brendbech
- 123
2
votes
2 answers
Help me solve a roommate argument about leaving the AC on / vs turning on two when needed
I live in a home with 2 other roommates. One is a neuroscientist from MIT who contends that opening the window "wastes a week's worth of cooling down the apartment". Her perspective is that even if there is a 10 degree temperature difference…
makerofthings7
- 1,047
1
vote
1 answer
What is the role of the plug in Joule-Thomson expansion?
I've read a lot on J-T effect but it isn't still very clear...
What is the role of the plug or valve ? It seems to me a very strange "non physical" requirement... It is often said that because of the plug the pressure decreases. But why ?
Why the…
Anarchasis
- 1,343
0
votes
1 answer
Cooling a bottle to around -70°C the easy way
As the topic already tells, I want to cool a glass or aluminium bottle down to roughly -60 to -70 °C for the sake of science. Additionally this setup should be portable for showcasing it at school.
I already looked around for options and found…
Xenox
- 161
0
votes
1 answer
A question about cooling (related to a question asked by someone else)
It's a simple question, but this post asking why it is that tea cools faster when it is evenly divided into two different cups, made me wonder if it's a similar case for solid food. An answer to the tea question is that the tea cools mostly by…
matryoshka
- 805
-1
votes
2 answers
Self sustained cooling approach
I have a hot object (about 200 centigrade), and would like to cool it down. Is there a way to use its heat to operate a cooling system without exerting external energy; as heat is energy and can theoretically be transformed to other forms? I would…
Novice Physicist
- 113