Question
Question: When the ends of a glass tube are heated, they gradually become spherical in shape. This phenomenon ...
When the ends of a glass tube are heated, they gradually become spherical in shape. This phenomenon occurs due to:
A
tension
B
surface tension
C
pressure
D
gravity
Answer
surface tension
Explanation
Solution
When the ends of a glass tube are heated, the glass becomes molten or semi-molten. In this fluid-like state, the material tends to minimize its surface area due to the cohesive forces between its molecules. This tendency to minimize surface area is known as surface tension, which causes the ends to form a spherical shape.