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Why Is the Average Kinetic Energy of Ideal Gas Molecules Related to Temperature?

Why Is the Average Kinetic Energy of Ideal Gas Molecules Related to Temperature?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: In an ideal gas, absolute temperature measures the average translational kinetic energy of its molecules. Raising the temperature increases that average energy, although individual molecules still move at different speeds. Sensei’s...
Why Can a Large Bucket of Warm Water Contain More Thermal Energy Than a Small Cup of Hot Water?

Why Can a Large Bucket of Warm Water Contain More Thermal Energy Than a Small Cup of Hot Water?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: Temperature tells you how hot water is, but the amount of thermal energy depends on how much water you have, too. A bucket can contain more internal energy even when its temperature is lower, because it contains much more...
Why Does a Balloon Expand When It Is Heated?

Why Does a Balloon Expand When It Is Heated?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: A balloon can expand when it is heated because the gas inside gets warmer and pushes harder against the flexible rubber. The rubber stretches until the pressure forces balance again. The gas then takes up more space. Sensei’s...
Why Does Gas Pressure Increase When Temperature Increases at Constant Volume?

Why Does Gas Pressure Increase When Temperature Increases at Constant Volume?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: When a gas gets hotter inside a sealed, rigid container, its molecules move faster on average. They strike the container walls more often and transfer more momentum in each collision. Since the gas cannot expand to make more room,...
Why Does Gas Pressure Decrease When Volume Increases at Constant Temperature?

Why Does Gas Pressure Decrease When Volume Increases at Constant Temperature?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: When a fixed amount of gas expands at a constant temperature, its molecules have more room to move. They collide with each unit of wall area less frequently, so the gas exerts less pressure. This is the idea behind Boyle’s law....
Why Does a Bicycle Pump Get Warm When You Compress Air?

Why Does a Bicycle Pump Get Warm When You Compress Air?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: A bicycle pump gets warm because you do work on the air as you compress it. That work can increase the air’s internal energy, making its temperature rise. Some of that energy then warms the pump’s walls. Friction in the pump can add...
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