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# Naa
The temperature on the thermometer wouldn't change because the amount of heat energy held by the thermometer itself would remain the same, since the vacuum around it would stop any heat energy from being lost or gained.
(, Tue 30 Dec 2008, 10:31, archived)
# You're forgetting that this is a magical thermometer that doesn't occupy any matter
It wouldn't have any heat energy.
(, Tue 30 Dec 2008, 10:34, archived)
# If the thermometer is hotter than the surroundings
then it would slowly cool down. If it was colder, then it would slowly heat up.

Think of a vacuum flask - sure, it keeps hot things hot and cold things cold, but not for ever! Damn you and your hollow promises of eternal piping hotness, vacuum flasks!
(, Tue 30 Dec 2008, 11:04, archived)
# NO NO NO
The thermometer doesn't occupy any matter. It behaves exactly like its surroundings. This is crucual to my point.

I can't remember why but it is.
(, Tue 30 Dec 2008, 11:10, archived)
# If the thermometer doesn't occupy any matter
how can it give a temperature reading? I is confuzzled.
(, Tue 30 Dec 2008, 11:19, archived)
# It's a theoretical thermometer
(, Tue 30 Dec 2008, 11:33, archived)