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170
Hero of Alexandrea creates the first "steam engine
Even though it was not practical it proved people's knowledge of what steam can do.(the date says 170 because Timetoast won't accept "70AD") Anyway there was a boiler where water was heated into steam. A hollow ball or chamber with nozzles was mounted on top wilth hollow tubes in a way that the ball could spin. when steam went into the ball from the boiler it woul escape through the nozzles causing the ball to spin. -
435
Early Theory of heat by Empedocles
Empedocles gave the idea that everythng is made up of either Fire, Earth' Water, or Air. -
Thomas Savery invents and patents the first practical steam engine
Savery's steam engine used atmospheric pressure to push water out of a mine and into a container and stean from a boiler forces the water out of a pipe. -
Period: to
Phlogiston theory
All substances that could burn contained phlogiston. It flows out then the substance burns leavin only the ashes behind. -
Thomas Newcomen makes a better steam engine
Newcomen's engine was an improvement on Savery's engine. It also used atmosheric pressure but this included pistons. Steam pushed a piston up which moved a rocking beam which lowered the mine pump. Then a spray of water condenses then steam and creates a vaccum. Atmospheric pressure then pushes the piston down. This again moves the rocking beam which causes the mine pump to come back up and create a vaccum. Atmospheric pressure pushed water out of the mine and out a pipe. -
Period: to
The Caloric theory
When people found flaws in the phlogiston theory it was discarded. A new theory was proposed. It stated that all substances contained caloric. Caloric flows from warm objects to cooler ones. This theoy was accepted widely. -
Watt improves the steam engine
Watt's engine only used one piston and that piston was pushed both ways by steam it was an improvement because it's pistons were not affected by constant heaing and cooling, as Newcomen's had, because the piston remained hot at all times. Watt's engine boosted the Industrial revolution greatly because of how much more efficient it was. -
Count Rumford proposes his hypothesis
Rumford stated that heat is equivalent to energy. Because the caloric theory was so accepted his hypothesis was ignored. -
Mayer and Joule support Rumford's hypothesis
Julius Robert Mayer found evidence supporting Rumford's hypothesis that heat is related to energy. When he published this it was overlooked due to his lack of schooling. When he had finished studying and republished his work, James Joule had published the same thing. -
Period: to
The Kinetic molecular theory
The current theory of heat states that heat depends on the movement of molecules. The faster the molecules move the mre heat.
