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 Nov 26 accepted If I mix 1 unit of water at at 30C° with 1 unit of water at 60C°, is the resulting water at 45C°? Nov 26 comment If I mix 1 unit of water at at 30C° with 1 unit of water at 60C°, is the resulting water at 45C°? Thank you very much. During these two days I learned a lot. I'm now slightly better at physics! Your answer is really great and taught a lot. I wouldn't have even thought about it without comments. I'm now much more educated. I'm accepting it again. Nov 26 awarded Commentator Nov 26 comment If I mix 1 unit of water at at 30C° with 1 unit of water at 60C°, is the resulting water at 45C°? Wow... So complicated... I removed accepted answer for now so someone can do precise calculation. It's the same tap water heated, and the room temperature is °20C. Nov 26 awarded Yearling Nov 26 revised If I mix 1 unit of water at at 30C° with 1 unit of water at 60C°, is the resulting water at 45C°? added 8 characters in body Nov 26 accepted The temperature in space is about 3K, however there are almost no atoms in space. How can there be residual heat? Nov 26 asked If I mix 1 unit of water at at 30C° with 1 unit of water at 60C°, is the resulting water at 45C°? Nov 15 asked What happens if a motorcycle going at 50mph crashes head into a car going at 60mph? Nov 14 awarded Good Question Nov 12 asked How do we know which direction heat flows? From cold to hot, or from hot to cold? Nov 10 comment Is is true that if they can see me I can see them? Unclear what I'm asking? Nov 10 asked Is is true that if they can see me I can see them? Nov 6 awarded Critic Nov 5 awarded Editor Nov 5 comment Using gravity's force to do work? They seem to convert water's momentum into energy, no? What I mean is extracting energy purely based on gravitational force F = G*m1*m2/r^2. Like when you've two big rocks, they attract each other. Can't we somehow make them do work as well while they keep attracting? Nov 5 asked Using gravity's force to do work? Oct 17 asked The temperature in space is about 3K, however there are almost no atoms in space. How can there be residual heat? Sep 19 asked Can you record sound through vacuum? Like this: (object)(vacuum)(object) Sep 19 awarded Good Question