caloric, Until 1600, it was thought that heat was an invisible fluid called this., heat is...., a form of energy, culture, a learned way of life shared by a group of people, needs, basic, required conditions that we must meet in order to survive, 7000 BC, humans discovered fire, 100 BC, Romans developed central heating, where heat travels from one source to different areas of a building., 1200, Chimneys first appeared., 1800s, Forced - air heating started to be used., 1906, Electric heaters were invented., standard of living, A measure of how well someone lives., sustainable, means that something can be maintained or continued., 1700s, Cast-iron stoves are used to heat rooms.

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