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What is Common Hydrometer?

The common hydrometer was introduced by Robert Boyle in the 17th century. It consists of three parts: 1. The weighed bulb which causes the hydrometer to float upright. 2. The wide bulb which displaces sufficient liquid for the upthrust. 3. The graduated stem which is narrow and graduated to read the specific gravity or density … Read More»

Simple Experiments to Demonstrate Upthrust

Below you can learn about a simple Experiments to Demonstrate Upthrust :- 1. If a closed hollow tin or a ball is pushed below the surface of water, an upward force is felt on the hand. If the ball or tin is released, it bounces upwards and jumps over the surface, showing that an upthrust … Read More»

How heat energy is obtained from chemical energy?

Heat energy is obtained from chemical energy by combustion, e.g. by burning a fuel such as coal, gas, kerosene, etc. It is also obtained by radiation when infrared rays strike an object, e.g. radiation from the sun, electric heating elements, etc. Heat generally causes expansion and can be used up to do work. In a … Read More»

What are the principles of conservation of energy?

The principle of conservation of energy states that energy cannot be created or destroyed, i.e. in an isolated system, the total energy before transformation is equal to the total energy transformation. A few examples of energy transformation are given below: 1. In an electric bulb, electrical energy is converted into light and heat energy. 2. … Read More»

A short note on Archimedes’ Principle, Flotation

Archimedes, who lived around 300 BC, was one of the greatest Greek scientists of his era. He hailed from Syracuse and when the Romans attacked the city by sea and land, they were stricken and left dumbfounded by immense masses of missiles and stones hurled at them with incredible speeded and precision. Ships were lifted … Read More»

8 points explaining the basis of Latent Heat

Get information about 8 important point that explains the basis of Latent Heat. 1. If a drop of a volatile liquid like ether is placed on the hand, a cooling sensation is felt as it evaporates. This is because the ether absorbs the latent heat required for evaporation from the hand, which therefore feels cool. … Read More»

What is the difference between evaporation and boiling

The main difference between evaporation and boiling are : 1. Evaporation takes place at all temperatures, while boiling occurs at a particular temperature. 2. Evaporation takes place from the surface, whereas the entire liquid boils. 3. Evaporation can occur using the internal energy of the system, while boiling requires an external source of heat. 4. … Read More»

What are the useful effects of evaporation?

Some of the most useful effects of evaporation are given below. 1. Water is in earthen pots because water seeps through the pores on to the outside from where it evaporates fast due to large surface area. The latent heat required for evaporation is taken from the water within the pot, which is therefore cooled. … Read More»