the answer is particles !
bigger.
In general, particles do not get bigger when they are heated. When particles are heated, they gain energy and move faster, which may cause materials to expand due to thermal expansion. However, the individual particles themselves do not increase in size.
Materials that shrink when heated include certain types of plastics, rubber, and fabrics.
materials usually expand when heated.
Most materials expand when heated due to increased molecular motion, causing the particles to move farther apart. However, if heated to extremely high temperatures, materials can undergo phase changes, such as melting or vaporization. Additionally, some materials may decompose or undergo chemical reactions when heated.
Materials that tend to expand the most when heated include gases like air, and some metals like aluminum and copper. These materials have higher coefficients of thermal expansion compared to others, causing them to expand significantly when heated.
It gets bigger
When gas molecules are heated, they gain kinetic energy and move faster, causing them to occupy a larger volume or expand. However, the actual size of the gas molecules themselves does not change when they are heated.
When particles are heated or cooled, they do not change size at all. They simply move with greater kinetic energy so the space between particles increases. This prompts the changes in size we see when substances are heated or cooled.
When a material is heated, the particles within the material gain energy and vibrate more rapidly. This increased movement causes the particles to push farther apart, which can result in the material expanding or getting bigger.
it expands and it becomes bigger
This movement is called convection. It occurs when heated materials rise due to lower density, while cooled materials sink due to higher density, creating a circulating flow.