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Cement and concrete
Secure a small bag of Portland cement. Have the pupils mix it with water and put it in tin can covers, paper cups, or small pasteboard boxes unless it hardens. Study its appearance and its properties. Break a piece of cement and study it. Mix the dry cement with about twice as much sand or gravel. This will form concrete. After adding water and mixing thoroughly place it in moulds. Permit these to arden various days. Again study the appearance and the characteristics of these samples.
What makes streams look muddy? After a heavy rainfall have peoples take samples of running muddy water in glass jars. Let the water stand for many hours unless the sediment has
Simple hydraulic press The principle of the hydraulic press is illustrated by the following model. Half fill a cylindrical jar with water. Pour melted paraffin wax on the su
How to make an overflow can and catch bucket These are useful for the study of Archimedes' principle, which controls floating and sinking. To make an overflow can secure a tin
factors which decide the broad area of scientic activity
Heart Massage for Restoring Circulation : In cases of breathing failure, you should check that the casualty's heart is still beating. This is especially important with victims of
Locate Polaris, the North star, and comment on it's elevation over the Northern horizon. Using the keyboard controls (J, K and L keys), fast forward the program 6 - 12 hours and c
explain the process of respiration in human beings
For chemically reactive wastes : The chemical property of the waste could be used in its removal in a number of ways as given below: i) Some water-reactive waste could be dispo
atomic spices definition?
Stimulus and Response: Scientists concerned with human behaviour and attitudes, namely psychologists, have tried to understand the basic process of learning, starting from simple
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