Liquid Thermometer Liquid thermometers are based on the principle of change of volume of the liquid with change in temperature. These thermometers are suitable for a narrow range of measurements. The most commonly used liquids are (i) mercury and (ii) alcohol. The range of the mercury thermometer is – 39°C to 357°C. Alcohol thermometers are … Read more
Types of thermometer There are different kinds of thermometers. 1. Liquid Thermometers These thermometers are based on the principle of change in volume of a liquid with change in temperature. Mercury and alcohol thermometers are based on this principle. 2. Gas Thermometer These are based on the principle of change in pressure or volume with … Read more
Thermometry The branch of heat relating to the measurement of the temperature of a body is called thermometry. The thermometer is an instrument used to measure the temperature of a body. The essential requisites of a thermometer are given as under: 1) Construction, 2) Calibration, and 3) Sensitiveness. For the construction of a thermometer, the … Read more
Heat and Temperature What is heat? What is temperature? Heat is a kind of energy. We have seen that energy can do work. By applying force it is possible to displace a body in the direction of the force, for example, heat is produced by burning fuel oil in a train or a car and … Read more
Human Bodies and Machines In our daily life, we use many different types of devices. To travel we use cars, to preserve the food we keep them in the refrigerator, for comfort on hot days we turn on the electric fan, to learn news we watch the television, etc. This list is very long and … Read more
Contributions of Jagadish Chandra Bose Acharya Sir Jagadish Chandra Bose was a renowned physicist, as well as a successful biologist. He was the first internationally recognized scientist of this subcontinent. The forefathers of Jagadishchandra Bose lived at the village of Rarikhal of Bikrampur in Dhaka district. He was born in 1858 in Mymensingh. His father, … Read more
Background of Biophysics Biology tries to understand the diversity of the living world and the process through which living things lead their lives. How do the animals collect food, develop relations with one another, perceive the environment and reproduce all these are the subject matter of biology. On the other hand, the laws followed by … Read more
Efficiency Efficiency: The ratio of the amount of work we get from an engine given is its efficiency. Effective Energy: The energy that we get from an engine is its effective energy.What do you mean by 70% efficiency of a pump? 70% efficiency of an engine means 100 J input of energy in the engine … Read more