...rsistence of sound called reverberation. In big halls or auditoriums to reduce reverberation, the roofs and walls are covered by sound absorbing materials like comp...
...lective permeable membrane (because it prevents movement of some materials).
- It h...low or orange)
2. Leucoplasts (White or colorless plastids; stores materials such as o...
...the action of oxygen on the food and help in the preservation of food materials.
C...s of Soaps
Different kind of soaps are made by using different raw materials.
To...
...e are wood (Contains 50% cellulose rest being lignin, resins, etc) and cotton (contains 90% cellulose rest being fats and waxes).
Several materials are obtai...
...(CH2) 5COOH] and is biodegradable.
Some More Impotant Polymers
Saran is a copolymer of vinyl chloride and Isused for wrapping food materials.
ASS ru...
...called pulverisation.
Concentration of Ores
Removel of unwanted materials (e.g., sa...The furnaces used in calcination and roasting employ refractory materials which res...
...ar forces, nuclear reactions and radioactive materials, is calle...tional reactor, it produces more fissionable materials than it u...els are consumed.
Fertile and fissile materials A fe...
...vities. These activities release materials which pol...humans, animals, vegetation and materials. The chem...amage to building and sculptural materials of marble...aximize the incorporation of all materials used in t...
...kable and in the manufacture of chloroform.
7. Cement
Cement is an important building material. It is a product obtained by combining materials such as l...