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How the lungs work
Cut the bottom off a large bottle. Fit a cork to the neck with a Y tube in it. On every of the lower limbs of the Y tie a rubber balloon or a number of small bladder.
Tie a sheet of brown paper or sheet rubber round the bottom of the jar, with a piece of String knotted by a hole and sealed with wax. Pulling this string lowers the diaphragm and air enters the neck of the Y piece causing the balloons to dilate.
Pressing the diaphragm upwards has the opposite effect.
Sterilizing water by boiling The presence of tiny living plants and animals makes water inappropriate for drinking. Such forms of life can only be seen by a microscope. We can
Fits : Fits of various kinds may be accompanied by unconsciousness, and are usually characterized by the casualty being unaware of his/her reactions. You should remember the follo
Labels and Packaging's : In order to minimise the hazards associated with using a particular substance it is necessary to know what the precise dangers are. The label on the conta
Freezing by Contact with a Cooled Liquid: Immersion Freezing In this method, the food is immersed in low-temperature brine to achieve fast temperature reduction through direct
OBELIA IS CONSIDERED TO BE OF SPECIAL INTEREST IN ZOOLOGY AND AS AN ANIMAL SHOWING AN INTERMEDIATE GRADE OF ORGANISATION
Nucleic acids are polymers of nucleotides. Nucleotides are nucleoside phosphates.
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
Miller's Experiment The above theory could be tested by recreating in the laboratory on a small scale, the conditions which must have existed when life originated on the
Explain Cholesterol - Constituents of Bile Cholesterol: Cholesterol is an extremely important compound, a constituent of most cell membranes and the precursor of bile acids and
Water Borne Diseases: Diseases like cholera and typhoid, as well as diarrhoea and dysentery, are spread through water. Germs of these diseases multiply in the gut of the inf
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