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Why Do We Use Kelvin Instead of Celsius in Gas-Law Calculations?

Why Do We Use Kelvin Instead of Celsius in Gas-Law Calculations?

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

Foundational Physics Short Answer: We use kelvin in gas-law calculations because it measures temperature from absolute zero. Gas-law relationships describe what happens when the absolute temperature changes. Celsius starts at the freezing point of water, not at zero...
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...
Why Does a Refrigerator Need Electrical Energy to Move Heat?

Why Does a Refrigerator Need Electrical Energy to Move Heat?

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

Foundational Physics Short Answer: A refrigerator needs electrical energy because it moves heat from its cold interior into the warmer room. Heat naturally flows from warmer places to cooler places, not the other way around. Electricity runs a compressor that lets the...
Why Can’t a Heat Engine Convert All Absorbed Heat Into Work?

Why Can’t a Heat Engine Convert All Absorbed Heat Into Work?

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

Foundational Physics Short Answer: A heat engine cannot turn all the heat it absorbs into useful work because it operates in a repeating cycle. To complete that cycle, it must release some energy as heat to a colder place. This is a limit set by the second law of...
Why Does Steam Cause More Severe Burns Than Hot Water at the Same Temperature?

Why Does Steam Cause More Severe Burns Than Hot Water at the Same Temperature?

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

Foundational Physics Short Answer: Steam can cause a more severe burn than hot water at the same temperature because steam releases additional energy when it condenses into liquid water on your skin. After condensing, the resulting hot water can also cool down and...
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