When a temperature gauge reads 'hot', which of the following best describes the kinetic energy of the particles in the substance being measured?

• A. The particles have high average kinetic energy.
• B. The particles have low average kinetic energy.
• C. The particles are stationary.
• D. The particles have zero kinetic energy.

Answer: (A)

Verified step by step guidance

1. Understand that temperature is a measure of the average kinetic energy of the particles in a substance.
2. Recall that when a temperature gauge reads 'hot', it indicates a higher temperature compared to a 'cold' reading.
3. Recognize that higher temperature means the particles are moving faster on average, which corresponds to higher kinetic energy.
4. Eliminate options that suggest particles are stationary or have zero kinetic energy, as these correspond to very low or absolute zero temperatures.
5. Conclude that the best description is that the particles have high average kinetic energy when the temperature gauge reads 'hot'.