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Making a 'gusher' with compressed air
Secure a large narrow-necked bottle like as is used for soda water. Place a single-hole stopper in the bottle. By the stopper put a 10- cm length of glass tube which has been drawn to a jet on the outside end. With a short length of rubber tube join a length of glass tube that will extend nearly to the bottom of the bottle. Fill the bottle about half full of water. Insert the stopper firmly and hold it in with your fingers. Next blow hard into the bottle; and when you free the pressure, point the bottle away from you. What happens?
Astronomy and Physical Sciences: Astronomy was used not only for working out the calendar, the dates of the eclipses and for the determination of time but also for casting h
Anthropological Evidence Modern humans arose at a time when the Earth was going through a very cold and icy period called the Ice Age, which began about 75,000 years ago and
What determines sinking and floating? Shape a piece of lead, tin or aluminium foil into the form of a little boat and float it on the water in a pan; now wad the metal foil fro
Why are nematodes agriculturally very important? Nematodes are the abundant soil microfauna. Being predatory and saprophytic in nature they cause a loss of vigour of the root
a. Which type of ripple marks would you expect to see on the bed of a river? Why? b. Which type would you expect to find on the floor of a standing body of water? Why? c.
Explain Skin Secretions - External Defence Mechanism The oil and sweat secreted by sebaceous and soporiferous glands contains fatty and lactic acids, which makes the surface of
Dew-point temperature You can calculate the dew-point temperature with a shiny can having some water, a thermometer and some ice. The dew-point temperature is an significant we
Q. List the methods of oil extraction? The methods of oil extraction are: (i) traditional method (ghani); (ii) improved methods, such as hydraulic pressing, screw pressing, pre
Bile pigments and bile salts - abnormal constituent of urine These occur in urine in conditions of hepatic and obstructive jaundice i.e. obstruction to the flow of bile into th
alternative naturalenergyresourcebasedo on undergroundhot water source
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