Physics 101- Introduction to Mechanics
|February 27- Introduction to Energy|
Since the mid 1700's people thought that hot objects
contained an abundance of a fluid called caloric. An object feels
hot because of the caloric it holds (much like a sponge feels wet because
of the water it holds). When we bring hot and cold objects together
caloric flows between (much like water form the wet to the dry sponge).
Joule showed that the temperature change of water/ beer was related to the amount of mechanical energy put into the system (via falling weights). He measured the amount of gravitational energy and the change in the waterís temperature very precisely.
He showed that for many different conditions the
amount of caloric inputted to the water was proportional to the amount
of gravitational energy. He also looked at chemical and electrical
Joule showed that the model of calorics was incorrect,
that temperature increases were simply due to transfers of energy.
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