Definition of Ampere
The ampere is the constant current which, flowing through two straight parallel infinitely long conductors of negligible cross-section, and placed in vacuum 1 m apart,…
Physics
System International de Units
To measure a quantity, we always compare it with some reference standard. To say that a rope is 10 metres long is to say that…
Forces of Nature
Sir Issac Newton was the first one to give an exact definition for force. “Force is the external agency applied on a body to change…
Specific Latent Heat
Specific Latent Heat While change the states every substance takes heat in or liberated out. But during the course of changes, the temperature remains constant,…
Why desert is very hot in day time and extremely cold at night?
Sands are very good absorbers of radiation and at the same time sands are very good radiators. At day time sands absorb heat from the…
Why the space craft’s have highly polished surfaces?
Space Craft’s have highly polished surfaces to reflect away the radiated heat from the sun. The fire man wear garments with highly polished surfaces so…
Why we feel warmer in a cloudy night than a clear day?
A cloudy night is found to be warmer than a clear night. This is due to the fact that cloud being practically opaque does not…
Why the people in hot countries wear light colored clothes?
In hot countries people keep cold by wearing light colored cloths and in white painted house. This reduces the amount of heat absorbed, because white…
Why the cooking vessels are painted dull black outside?
For rapid heating, the cooking vessels should preferably be painted dull black outside so as to increase its absorbing power. On the other hand, the…
Thermocouple
If two wires of dissimilar metals, say copper and iron, be joined at two ends and if the two junctions be maintained at two different…
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