If you heat up any object, energy is transferred between the heat source and then into the object's thermal energy store, thus increasing its temperature.
Heat is transferred by Conduction via solids, Radiation via empty space or the air, and finally, Convection by liquids.
For objects to be heated up using conduction, vibrating particles transfer energy to other particles via kinetic energy, since they are being heated up and the heat excites them causing them to move extremely fast.
causing heat to disperse throughout the object, this is why when you heat up a metal rod.
Heat creeps around and eventually causes the metal bar to roughly be the same temperature regardless of where the heat is coming from.
Different materials can take in various amounts of heat depending on their thermal energy stored, and how well they can conduct heat is their Thermal conductivity, so metals have better thermal conductivity compared to something like plastic which has low thermal conductivity.
That is why we use plastic as insulators for heat in tumblers and bottles when storing hot or cold water, as it traps heat better.
Let’s take a beaker fill it with water and put a Bunsen burner below it when you heat up the liquid or gas, the particles at the bottom will start moving around, and they naturally want to move to a place cooler, the fluid or gas in the warmer region starts to heat up and expand.
Let's go back to the beaker, if we heat up the bottom with the bunsen burner the warm particles at the bottom will want to rise up and get to the cooler region which is the top of the beaker
No comments:
Post a Comment