Units of Force
The unit of force in the S.I. is 'newton'. (Symbol : N) One newton is that force which when acting on a body of mass 1 kg produces a uniform acceleration of 1 m s - 2 in its own direction. The C.G.S unit of force is 'dyne'. One dyne is that ..
Control of Air Pollution
Control of Air Pollution - Air pollution can be controlled either at source or at the dispersal stage of various pollutants. Although, the problem of controlling air pollution at source is not easy, it can be reduced to some extent by taking steps such as: Use of moder..
Classification Based on Molecular Forces
Elastomers are polymers in which the polymer chains are held by weakest intermolecular forces. These forces permit the polymers to be stretched. A few cross links are introduced between the chains to help the polymer retract to its original position after the force..
Control of Air Pollution
Air pollution can be controlled by different methods depending on the source and the pollutant. The different methods are: One of the major causes of air pollution are the automobiles. The fuels being used should be lead-free as this will reduce the level of lead in the atmosphe..
Absolute units of force
Without units, force could only be expressed as a weak, strong, not so weak or strong force. But these expressions give a very vague and incomparable idea of the magnitude of force. Therefore, a clearly defined and easily understandable unit is esse..
Electromotive force
It is the work done per coulomb in moving a test charge once around the circuit or it is the potential difference between the two poles of a cell in an open circuit. The unit of emf is vo..
Forces Summary
Summary - Force produces or prevents motion of a body. Friction is a force that opposes motion. Moment is defined as the turning effect of a force about a pivot or fulcrum. The centre of gravity of a body is a point where the whole weight of the body seems to be concen..
Types of Air Pollution
Based on the possible reasons, air pollution could be classified into Accidental air pollution Industrial air pollution Transport related air pollution Dwelling related air polluti..
Industrial air pollution
can be Pollution from thermal power plants due to chemical fertilizers, food, pesticide and pharmaceutical industries due to cement, steel, paper, sugar industries due to textile and textile related industries due to petroleum and other industries due to atomic units..
Path Taken by Inhaled Air
The composition of air that we breathe in is: Nitrogen - 78% Oxygen - 21% Carbon dioxide - 0.03 - 0.04% Hydrogen - traces Noble gases - traces Thus the air naturally contains more oxygen than carbon dioxide. This oxygen-rich air is taken in by the nostrils. In the nas..
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