Question

Pat pours cold, liquid cream into a cup of hot coffee. Which of the following describes how the hot coffee and cold cream will interact?
A.
The cold cream will drop to the bottom of the cup. When it warms, some of it will rise back to the surface.

B.
The cold cream will remain at the surface. When it warms, some of it will fall to the bottom of the cup.

C.
The cold cream will immediately reach the same temperature as the coffee and spread evenly though the cup.

D.
The cold cream will drop to the bottom of the cup. It will remain there, unless it is stirred.

Answer 1

Answer: The correct answer is- option A).

Cold liquid cream has higher density as compared to hot coffee. When Pat pours cold liquid cream into a hot coffee cup, it will be dropped down to the bottom of the cup (due to higher density). After this, some of the cold liquid cream will rise up to the surface as it becomes hot ( as hot has low density).

Thus, option A) is the right answer.

Answer 2

A. The cold cream will drop to the bottom of the cup. When it warms, some of it will rise back to the surface.