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
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
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
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
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
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
Get information on Applications of Archimedes’ Principle; Flotation: 1. Floating of Ships An iron nail sinks in water. Due to its small volume, the upthrust which is equal to the weight of water displaced is less than the weight of the nail, and therefore it sinks. Moreover, the density of the nail is more than … Read More
Water has the highest specific heat capacity. It therefore takes a long time to heat and long time to cool. The following uses/ effects are due to the high specific heat capacity of water. 1. Fomentation: Hot water bottles are used for fomentation, as the water remains hot in the bottle for a long time … Read More
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
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