The plasma membrane of a cell breaks down? Give reason for the following observation (a) Naphthalene balls disappear with time without leaving any solid. (b) gases exert more pressure on the walls of the container than the solid. (c) Doctors advise to put strips of wet cloth on the forehead of a person having high fever.
Answers
Answer:
a)Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.
b)Gases exert more pressure on the walls of the container than solids do because there is more kinetic energy(thermal energy) in the gases which make it's particle to move with great speed.
c)Heat is abosrbed by water from it's surroundings for phase change from liquid state to gaseous state. When strips of wet cloth are put on the forehead of person having fever, the water in the cloth absorbs heat from hot forehead to get vaporise. It helps to decrease the extra heat in the body caused due to high fever consequently helps to reduce body fever.
Explanation: