00:00Imagine a tin can and a book that have been sitting in the same room all day.
00:05You touch both.
00:07Which one is colder?
00:10The can, right?
00:11It feels that way.
00:13But they're actually the same temperature.
00:16So why the difference?
00:18Heat flows through some materials much more easily than others.
00:21That property is called thermal conductivity.
00:26Your hand is warmer than both objects.
00:28So when you touch them, heat flows from your skin into them.
00:33Metal has high thermal conductivity.
00:35That means it carries heat away quickly, cooling your skin.
00:40The book conducts heat much more slowly, so your skin stays warmer.
00:45Same temperature, but different rates of heat transfer.
00:50So how hot or cold something feels depends on more than just its temperature.
00:55The speed of heat transfer matters too.
00:58The speed of heat transfer matters too.
00:58Matthewk
00:58Saint replaced himself with the wheel.
