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Holding water in a sieve Pour some oil over the wire mesh of a kitchen sieve and shake out the overload so that the holes are open. Cautiously pour water into the sieve from a
TO SHOW THAT AIR HAS WEIGHT Drive a thin nail by the exact centre of a long rod such as a metre stick or a yard stick. Balance the stick by resting the nail on the rims of two
solar system At night you can see very many stars in the sky. But during the day, only one star is .visible, and that is the Sun. This is not because there is anything extrao
Explain Precipitation - Antigen-Antibody Interaction If Ag-Ab are present in an appropriate ratio, they form a precipitate in blood. Turbidity is developed, this can be measure
What is our responsibility to nature?
Explosives : As defined earlier, explosives release a large amount of gas and energy in a very short time. These are of four basic types: Mixed gases - Usually the mixture
Explain the Mucous Membrane This layer is lined by the epithelial cells. Parts of the tract which are subject to mechanical injury, the layer consists of stratified squamous ep
Storage of Chemicals : You have read about the stores as important structures of all the labs in previously. Storage of chemicals whether in small amount or in bulk is another imp
A compressed air pop-gun Use a straight piece of glass or plastic tubing of 1 or 2 cm in diameter and 15 or 20 cm in length. Make a piston by twisting some string on a pencil t
A wet and dry bulb hygrometer Get two inexpensive thermometers, and check them in warm water at dissimilar temperatures to see that they agree. Join the two thermometers to a
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