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How to make a simple vacuum pump
Secure a bicycle or automobile hand pump. Open the pump and delete the piston. Un- screws the bolt that holds the leather washers. Reverse the washers by turning them over. Change the washers on the piston and insert in the pump cylinder. A pump of this sort will serve to do a lot of simple vacuum experiments
CHEMICAL EFFECTS OF AIR Wash a small wad of steel wool in gasoline, benzene or carbon tetrachloride (car- bona) to delete any grease. Squeeze it out and then fluff it. As soon
how many types of heterotrophic nutrition in plants?..
Mechanics: Another hnch of science which is, perhaps, the greatest contribution of Greek civilisation is mechanics. Mechanics developed out of the necessities of imgation,
Precautionary Measures Against Ionising Radiations The following guidelines are suggested for experiments using low activity radioactive materials: (1) Avoid skin contact
What is Soil Taxonomy The concept of soils as natural bodies was first developed by Russian soil scientist V.V Dokuchaev and his associates when they noted the relationship p a
Explain the Hypoxic Hypoxia It is a hypoxia resulting from defective oxygenation of the blood in the lungs. It is a problem in high altitudes where pO 2 of the arterial blood
factors which decide the broad area of Scientific activity
WHAT ARE THE ORGANS OF THE RESPIRATORY SYSTEM?
What are decomposers in a temperate deciduous forest? In the Deciduous Forest, many decomposers that are living there contain fungi, bacteria, and yes, even worms.
Fibre optics: The songs you hear on your transistor, or the pictures you see on your TV are canied from the studios to your home on radiowaves. Telephone calls you make, on th
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