Because when something heats it starts to develop into gas and the particles/atoms expand.
No, not all objects expand when heated. Most objects do expand when heated, but there are exceptions such as water between 0°C and 4°C, which contracts when heated. The expansion or contraction of an object when heated depends on its material properties.
Yes, but it is hard to see unless the object is massive.
They expand because their molecules vibrate more rapidly resulting in more space between the molecules which makes the object expand.
The molecules in an object begin to move because of the heat. The moving of the molecules cause the space between them to expand. That is how blacksmiths are able to change the shape of metals.
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Oil does expand when heated and contracts when cooled.
Heat causes ojects to expand . The object also will melt if it is a solid , and will turn into gas if heated.
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When matter is heated it will expand
Most substances expand when heated.
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Wood would expand about 0.3 millimeters if heated to 100 degrees