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Chapter 7: Problem 978

When there is no external force, the shape of liquid drop is determined by (A) Surface tension of liquid (B) Density of Liquid (C) Viscosity of liquid (D) Temperature of air only

Short Answer

Expert verified
The shape of a liquid drop when there is no external force is determined by the surface tension of the liquid. Therefore, the correct answer is (A) Surface tension of liquid.

Step by step solution

01

Understanding Surface Tension

Surface tension is a property of liquids that allows them to resist any external force. It's the force acting across the surface of a liquid that causes it to contract and minimize its surface area. Surface tension is what causes liquid drop to form a spherical shape in the absence of external forces.
02

Understanding Density

Density is the mass per unit volume of a substance. It determines how heavy or light a substance is for a given volume. The density of a liquid does not have a direct impact on the shape of a liquid drop when there is no external force acting on it.
03

Understanding Viscosity

Viscosity is a measure of a fluid's resistance to flow. It indicates how "thick" or "sticky" a liquid is. While viscosity might affect the speed at which a liquid drop forms, it does not determine the shape of the liquid drop in the absence of external forces.
04

Understanding Temperature of Air

The temperature of the air surrounding a liquid drop can influence the rate of evaporation and condensation and can cause the liquid to form drops more quickly or slowly. However, it does not directly determine the shape of the liquid drop when no external forces are acting on it. Based on the analysis of these factors:
05

Conclusion

The shape of a liquid drop when there is no external force is determined by the surface tension of the liquid. Therefore, the correct answer is (A) Surface tension of liquid.

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