All three states of matter solid, liquid and gas expand when heated. The atoms themselves do not expand, but the volume they take up does. When a solid is heated, its atoms vibrate faster about their fixed points. Evan Holbrook. Dec 5, They start to vibrate faster and spread out. Explanation: The addition of heat energy in this case is making the molecules vibrate more, thus spreading out the molecules.
Here is a picture:. Related questions Why do endothermic reactions happen? What causes energy changes in chemical reactions?
How do endothermic reactions absorb heat? The air above the fire will be warm due to convection. You can warm your hands near to the flames due to radiant heat transfer. When gases, liquids and solids are heated, they expand. As they cool, they contract or get smaller.
The expansion of the gases and liquids is because the particles are moving around very fast when they are heated and are able to move further apart so they take up more room.
If the gas or liquid is heated in a closed container, the particles collide with the sides of the container, and this causes pressure. The greater the number of collisions, the greater the pressure. Sometimes when a house is on fire, the windows will explode outwards. This is because the air in the house has been heated and the excited molecules are moving at high speed around the room. They are pushing against the walls, ceiling, floor and windows.
Because the windows are the weakest part of the house structure, they break and burst open, releasing the increased pressure. Add to collection. Go to full glossary Add 0 items to collection. Download 0 items. Twitter Pinterest Facebook Instagram. Email Us. See our newsletters here. Would you like to take a short survey? This survey will open in a new tab and you can fill it out after your visit to the site. Yes No.
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