Upthrust
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.
Summary
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.
Things to Remember
- Every liquid has a tendency to push the object towards its surface called upthrust.
- Formula for measuring density is : density= \(\frac{mass}{volume}\). The unit of density is kg/m3 .
- The ratio of the density of the substance to the density of water at 4 degree Celsius with the same volume is called relative density.
MCQs
No MCQs found.
Subjective Questions
No subjective questions found.
Videos
No videos found.

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
Relative density is the ratio of the density of the substance to the density of water at 4 degree Celsius. Relative density does not have aunit. According to the density of the liquid, upthrust differs. If the liquid has higher density then upthrust exerted by it increases. That is why an egg does not float on pure water but floats on salt water. With the addition of salt,we increase the density of water. Due to higher density,the egg floats.
Lesson
Pressure
Subject
Science
Grade
Grade 10
Recent Notes
No recent notes.
Related Notes
No related notes.