How fast molecules are moving. If they are moving fast its hot, but if they are moving slow it is cold
Cool water moves slow because the molecules are moving slow. In hot water, molecules are moving fast, thus, hot water seems to move faster than cold water at times.
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fast
They are generally slow.
slow
Heat is defined by how fast molecules are moving. Fast moving molecules will have a higher temperature than slow moving molecules. The kinetic energy of the hot air is transferred to the cold air, which means the cold air becomes a little warmer, and the hot air becomes cooler.
Fast moving stream
fast. not that fast but fast.
fast
fast
Heat is transferred by conduction when fast-moving molecules collide with slower-moving molecules, transferring kinetic energy. This causes the slower molecules to speed up and the faster molecules to slow down, leading to a transfer of thermal energy from hot regions to cold regions within a material.