Read the experiment and answer
In three 500 mL beakers, Ahmed put melted ice water, room-temperature water, and hot water. He put a thermometer into each beaker and recorded the temperature. He carefully placed a single drop of blue food coloring in the center of the surface of the water in each beaker. He planned to take observations at 5 minutes, 10 minutes, 20 minutes, and 30 minutes.
What does Ahmed's experiment model shows ?
(C) Chemical reaction
(D) Air masses.
(A) , (B) , (C) , (D)