Praxis Elementary Education Three-Subject Bundle – Science (5905) Practice Test

What term describes the lowest possible temperature at which particles have minimal motion?

Absolute zero Normal room temperature Thermal energy Boiling point

Correct Answer:

Absolute zero

Explanation:

At the lowest possible temperature, particle motion is minimized. This limit is absolute zero, defined as zero kelvin (about −273.15°C). In theory, reaching absolute zero would stop a substance’s thermal motion, but quantum mechanics means particles retain some zero-point energy and can’t be completely at rest. This makes absolute zero the boundary value for how cold matter can get. Normal room temperature is much warmer and involves noticeable molecular motion. Thermal energy is the energy associated with temperature, not a temperature itself. Boiling point is the temperature at which a liquid changes to a gas.

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