Linked Questions

12 votes
3 answers
3k views

Best way to chill a cup of coffee with cold water and 5 minutes [duplicate]

Initial data 1 x 3/4 full cup of hot coffee / tea / your favorite morning beverage cold water 5 minutes Considering that it's starting to get hot outside, and we all want to drink reasonably cold ...
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0 votes
1 answer
978 views

Blowing on a hot liquid [duplicate]

Lets say you have a nice bowl of piping hot soup. You use your spoon and take a sip and realize its too hot. So you blow on it a few times and now its cooled enough that it doesnt burn your mouth. ...
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  • 298
12 votes
4 answers
6k views

Does turning a spoon in water raise the temperature?

I read about Joule's experiment proving the transformation of mechanical work into heat. But say I have a bowl with some water, and I start turning a spoon in it very fast, thus doing work — the ...
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  • 283
12 votes
2 answers
22k views

Does tea stay hotter with the milk in it?

A little thought experiment, similar to this one: Imagine you are making a cup of tea when the door bell rings. You've poured the boiling water into a cup with a teabag in it. As you're just about to ...
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  • 221
6 votes
4 answers
16k views

Why does blowing on hot coffee cool it down?

And will it cool off faster if you blow across the top of the cup or directly into the coffee? Does it have to do with the fact that when you blow across the top of the cup the velocity of the air ...
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3 votes
3 answers
11k views

Does stirring water in a bucket in whirlpool keeps it warm?

I did an experiment when I was a teenager. I want to prove/see what really went on in that experiment. When taking a bath, take a warm water in bucket and start taking a bath. You will notice that ...
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  • 346
5 votes
4 answers
2k views

What is the way to prevent the cream from settling on the surface of hot milk with least manual labour?

I have seen Cooling a cup of coffee with help of a spoon but that question has a restriction of using only a spoon. My problem is that I have to boil the milk before pouring it in the bottle for the ...
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1 vote
3 answers
4k views

Hot Chocolate- cooling itself down

If a hot cup of hot chocolate is just standing there, can it cool itself down by transferring the kinetic/thermal energy that the liquid has into the mug/cup?
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  • 11
4 votes
2 answers
2k views

Heating coffee by yelling?

Is it a myth that yelling to a coffee mug will heat it? I have been hearing my friend saying that screaming will heat coffee or water.
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  • 241
2 votes
1 answer
1k views

Can you increase the temperature of a bottle of water by vigorously stirring it?

By vigorously stirring water with a glass rod, you could potentially increase its kinetic energy which would in turn increase the temperature of the water. Similarly, would increasing the energy of ...
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0 votes
2 answers
878 views

Why does hot water gets cooler on stirring instead it should have gotten hotter

When we keep on stirring hot water vigorously it starts getting cooler. But we are increasing the random kinetic energy of the molecules of water. Heat is as it is the energy of RANDOM motion of atoms....
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  • 2,587
0 votes
1 answer
302 views

Can I manually speed up convection?

Let's say, I have half bucket of boiling water and I have added equal amount of freeze cold water to it. I want to have equilibrium temperature reached as quick as possible. Can I speed up the ...
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3 votes
0 answers
782 views

Does coffee with cream cool slower than black coffee?

At Modernist Cuisine, Nathan Myhrvold states that "Coffee with cream cools about 20% slower than black coffee". He then gives three reasons, two of them related to radiation and the third one to the ...
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0 votes
1 answer
201 views

Formulas related to "Cooling a cup of coffee with help of a spoon" [closed]

I was recently going through some of the top voted questions on the thermodynamics tab. And, I came across Cooling a cup of coffee with help of a spoon. I found this question really interesting. In ...
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2 votes
0 answers
126 views

Which will dry faster? [closed]

Assume that you have a wet shirt that you have just washed. You squeeze of the surplus water that can be squeezed out. Method 1: 1)You iron the shirt for 5 minutes and then hang it out to dry out in ...
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