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Chapter 15: Problem 5

Why is it easier to float in the ocean than in fresh water?

Short Answer

Expert verified
It is easier to float in the ocean than in fresh water because seawater is denser than freshwater due to its salt content. This greater density leads to a higher buoyant force, making floating easier in the ocean.

Step by step solution

01

Understand the Concept of Density

Density can be defined as mass per unit volume. Every substance has a distinct density. Compared with fresh water, seawater has more mass because of its salt content, meaning it has a higher density.
02

Apply Archimedes' Principle

According to Archimedes' Principle, an object will float in a fluid if it's less dense than that fluid. A fluid exerts an upward force called buoyancy on objects in or on the fluid. The force of buoyancy is equal to the weight of the volume of fluid displaced by the object. This force is greater in a denser fluid, like seawater, than in a less dense fluid, like freshwater.
03

Compare Buoyant Force in Ocean and Fresh Water

The ocean water's higher density means that it can exert a stronger buoyant force than fresh water can. Therefore, when someone is trying to float, the ocean will offer more resistance to sinking due to this broader buoyant force. Conversely, freshwater, having less density, provides less buoyant force, making it harder to float in.

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