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Jun
22
revised A fan in a hot room at what point does it put in more energy that it dissipates
added 214 characters in body
Jun
22
comment A fan in a hot room at what point does it put in more energy that it dissipates
@Vintage: Another good point. I'll edit my answer to include the points that you and Mitchell have made.
Jun
22
answered Conversion of mass to energy in chemical/nuclear reactions
Jun
22
awarded  Critic
Jun
22
comment Does hot air really rise?
With respect to water, the temperature at which warm water becomes less dense than cold is 4° C. van.physics.illinois.edu/qa/listing.php?id=1736
Jun
22
comment A fan in a hot room at what point does it put in more energy that it dissipates
@Mitchell: Excellent point
Jun
22
revised A fan in a hot room at what point does it put in more energy that it dissipates
added 34 characters in body
Jun
22
awarded  Teacher
Jun
22
answered A fan in a hot room at what point does it put in more energy that it dissipates
Jun
22
answered Finding Directions using moon
Jun
21
comment Is the entire Universe the same age?
@Ted Bunn: Nice addition. I question your last paragraph, though. Wouldn't general relativistic effects make that not true, since time flows slower in a gravitational field? (As an extreme case, consider the adventures of an observer near the event horizon of a black hole who can manage to watch the universe age billions of years while mere minutes elapse for himself.)
Jun
21
awarded  Editor
Jun
21
revised Is the entire Universe the same age?
added 311 characters in body; added 12 characters in body
Jun
21
answered Is the entire Universe the same age?
May
19
awarded  Supporter
May
19
awarded  Autobiographer