When an object is cooled, the energy of its molecules decreases. Cooling reduces the thermal energy of the molecules, causing them to move more slowly.
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Heat is a type of energy that can be converted into work. Count Rumford (Benjamin Thompson) first gave direct evidence of this through his experiments on the boring of cannons, which demonstrated the mechanical equivalent of heat.
The scientist who first melted two pieces of ice by rubbing them together was Sir Humphry Davy. He demonstrated that friction could generate heat, which melted the ice.
When some water is churned continuously, its temperature increases. In this process, mechanical energy is converted into thermal energy due to the work done on the water, which raises its temperature.
The temperature of boiling water in a steam engine can become high because there is high pressure inside the boiler. This elevated pressure increases the boiling point of water, allowing it to reach higher temperatures before vaporizing into steam.