(i) Viscosity of layer depends only on the nature of fluid and is independent of area considered or velocity gradient.
(ii) In case of liquids viscosity increases with density while for gases it decreases with increase in density.
(iii) With rise in temperature the viscosity of liquids decreases while that of gases increases.
(iv) With increase in pressure, the viscosity of liquids (except water) increases while that of gases is practically independent of pressure.
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