Describe these
(a) sublimation
(b) diffusion
(c) plasma
(d) brownian motion
(e) effect of pressure
Answers
A.sublimation is a phenomenon in which the solid state directly changes into gaseous state when heat is applied and when the gas is cooled it directly changes into solid state. Naphthalene can be cited as an example. sublimation is a very useful process in the separation of substances from one another.
B diffusion is a phenomenon by virtue of which an object which is in gaseous state or liquid state moves from the region of higher concentration to the region of lower concentration resulting in uniformity of the molecules of a particular structure. Solids have the least property of diffusion where has the highest property of diffusion is present in case of gaseous substances
C. Plasma is said to be the fourth state of matter which is created by adding extreme amount of temperature and pressure to a normal gaseous state it is mainly used in the manufacture of modern day television
D.Brownian motion is a phenomena in which there is movement of the particles of a colloidal substance when a Ray of light that is polarized is passed through it
E. with increase in pressure there is increase in the closeness of the molecules , as a result of this there is decrease in the volume of the liquid or The gas which is present due to the molecules coming close to each other