An object just floats in water. If common salt is added into the water what will happen

Correct option is C

The correct answer is: (c) The volume of the object immersed in the liquid decreases

When salt is added to water, the density of the solution increases because salt increases the mass of the water without significantly increasing its volume. An object floats when its density is less than or equal to the density of the liquid.
If the density of the liquid increases due to the addition of salt, less of the object needs to be submerged to displace an amount of liquid equal to its weight. Therefore, the volume of the object immersed in the liquid decreases.

Buoyancy Principle:
An object floats when the upward buoyant force equals its weight.
Buoyant force depends on the volume of liquid displaced, which decreases as the density of the liquid increases.

Applications of Salt Addition:

• Used in floating experiments, like making an egg float in saltwater.
• Relevant in understanding buoyancy in seawater, where objects float more easily than in freshwater.

Additional Information:

Archimedes' Principle:
Archimedes' Principle states that:
"When a body is partially or fully submerged in a fluid, it experiences an upward buoyant force equal to the weight of the fluid it displaces."

Key Points:

Buoyant Force:

• The upward force exerted by the fluid on the object is called the buoyant force.
• It opposes the downward force of gravity acting on the object.

Displacement of Fluid:

• The weight of the displaced fluid determines the magnitude of the buoyant force.
• Buoyant force = Weight of displaced fluid.

Condition for Floating and Sinking:

• If the weight of the object is less than or equal to the buoyant force, the object floats.
• If the weight of the object is greater than the buoyant force, the object sinks.

Applications of Archimedes' Principle:

• Ships and Boats: Designed to displace enough water to balance their weight and stay afloat.
• Hydrometers: Measure liquid density based on how much they float.
• Submarines: Control their buoyancy by adjusting the amount of water in ballast tanks.
• Floating Icebergs: Ice floats in water because its density is lower than that of water.