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CoachWhen a substance is heated, the kinetic energy of its molecules increases, causing them to move faster and further apart. This results in an expansion of the substance's volume. Conversely, when a substance is cooled, the molecules slow down and move closer together, causing the substance to contract.
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What is an increase in volume that occurs when heat is added to a substance called?
An increase in volume that occurs when heat is added to a substance is called thermal expansion. This happens because the particles within the substance gain kinetic energy and move further apart, causing the substance to expand.
Why does the substance in the column of the thermometer go up when it is heated?
When the substance in the column of a thermometer is heated, its temperature increases. As the temperature increases, the particles in the substance move more energetically and spread out, causing the substance to expand and rise up the column. This expansion is what causes the fluid to rise and indicate a higher temperature reading on the thermometer.
When a substance expands do the particles get bigger?
When a substance expands, the particles themselves do not get bigger. Instead, they move further apart from each other, creating more space between them, which leads to the expansion of the substance.
What substance expand to fill the entire volume of its container?
A gas can expand to fill the entire volume of its container because the particles are not confined and can move freely. When a gas is placed in a container, it will fill the entire space available to it.
Why does density decrease as temperature increases?
As temperature increases, the particles in a substance move faster and spread out more, causing the substance to expand and decrease in density.
