Two glasses labeled A and B contain equal amounts of water at different temperatures. Maya put a drop of blue dye into each of the two glasses. The table shows the time taken by the water in the two glasses to become blue

Dye Experiment

Glass Time

A 5 seconds

B 20 seconds

Which of the following statements is correct?

The water in Glass A is cooler than the water in Glass B, therefore, the particles in Glass A move faster

The water in Glass A is warmer than the water in Glass B, therefore, the particles in Glass A move faster.

The water in Glass A is cooler than the water in Glass B, therefore, the water particles in Glass A are stationary

The water in Glass A is warmer than the water in Glass B, therefore, the water particles in Glass A are stationary

Second statement: The water in Glass A is warmer than the water in Glass B, therefore, the particles in Glass A move faster.

Explanation:

The rate at which the drop of blue dye mixes with the water is called diffusion.

The motion (average kinetic energy) of the particles is proportional to the temperature. This is, the particles move faster as the temperature of the water increases.

Thus, since the water in the glass A took only 5 seconds to become blue, while the water in glass B took 20 seconds, it means that the blue dye diffused faster in the glass A, which drives to conclude that the water in glass A is warmer than the water in glass B.

Then, the statement that correctly describes this is the second one: "The water in Glass A is warmer than the water in Glass B, therefore, the particles in Glass A move faster".