Question

what is the measurement of average kinetic energy of a substnce?
○ kinetic transfer
● temperature
○ potential energy
○ radiation
question 12
warm air is _______ than cold air.
● less dense
○ more dense
○ equal to

Explanation:

1. For the first question: Temperature is defined as the measure of the average kinetic energy of the particles in a substance. The other options do not match this definition: kinetic transfer refers to energy movement, potential energy is stored energy, and radiation is a heat transfer method.
2. For Question 12: When air is warmed, its particles move faster and spread out, increasing volume while mass stays constant. Since density is $\frac{\text{mass}}{\text{volume}}$, an increase in volume leads to lower density compared to cold air where particles are closer together.

Answer:

1. Temperature
2. Less dense