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Physical adsorption Chemical adsorption Forces of attraction are van der Waals' forces. Forces of attraction are chemical bond forces. Low enthalpy of adsorption (20 - 40 kJ mol -1 ). High enthalpy of adsorption (80 - 240 kJ mol -1 ) Thi..

"> equal intervals of time, each of value (t/n) second. Let i lt i 2 , iy- i n be the average value of the currents flowing in these intervals. This a.c is passed through a resistance R. 2 t Heat produced in the first interval = i x R 2 t Heat produced in the second inter..

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1. Measurement. Any physical quantity is said to be known better if one can measure the quantity in discussion and express the same in standard form with numbers. 2.Units. The standard measure which expresses any physical quantity is called a unit. They add meaning to t..

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What is pollution ? Basis of human life depends upon how man utilizes its environment. Keeping his needs in the centre man is changing his environment and because of this question regarding environmental pollution has arised at global level. Pollution is an undesirable change in the h..

Our health is directly linked to the food we eat, because the food we consume gets converted into energy, which is needed for the functioning of all parts of the body. Improper intake of food leads to malnutrition and ill-health. A healthy life does not mean physical well bein..

The knowledge domain includes facts ideas. prhcipies md theories. Acquisition of knowledge ib an unrortant aim o "' ach'ng science. The student need to be given instruction for doing activities for devf>" oping information and concepts about the surrounding world. The activities ..