The different weights of a piece of stone on weighing in three different media-air, fresh water and salt solution are given in the table. Answer the following questions: X=12
Y=18N
Z=14N
i) Identify water, air and salt solution among X, Y and Z?
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Syllabus
Force
Pressure
Law of Flotation
Pressure
Pascal's Law
Upthrust
Archimedes Principle
Energy
Heat
Light
Electricity and Magnetism
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Overview
Density is a physical property of a matter. It can be defined as a ratio of mass per unit volume. This note gives an information about upthrust and density.
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Upthrust
Every liquid has a tendency to push the object towards its surface called upthrust. When a stone is immersed in water, water tries to push the stone to its surface. During this process the stone will lose some of its weight because water is trying to push it upward. Similarly water also pushes your body upward when you throw yourself into swimming pool. So it is easier for you to swim. So the upthrust of water will be
Upthrust = weight in air - weight in water.
Density and relative density:
Density is a physical property of a matter. It can be defined as a ratio of mass per unit volume. The qualitative definition can be the measure of the relative heaviness of an object with constant volume. For example, rock is denser than a piece of paper though they occupy the same volume (differ in the quantity of mass occupied in the same volume).
Formula for measuring density is density= \(\frac{mass}{volume}\). Unit of density is kg/m3