Home Preparation for National Talent Search Examination (NTSE)/ Olympiad
Chapter : 2. Force & Laws Of Motion
Laws of pressure
Laws of pressure Pressure exerted by the liquid is the same in all directions about a point. Pressure exerted is the same at all points in a horizontal plane as well as in a stationary liquid. Pressure at a particular depth is P = hdg where, h = height of the column of liquid. d = density of the liquid g = acceleration due to gravity
Different types of Pressure : (A) Hydrostatic Pressure : The normal force (or thrust) exerted by a liquid at rest per unit area of the surface in contact with it is called "pressure of liquid or hydrostatic pressure." (B) Atmospheric Pressure : The pressure exerted by atmosphere is called atmospheric pressure. At sea level, atmospheric pressure is the pressure exerted by 0.76 m of mercury column i.e. h = 0.76 m equal to 10 pascal 1 atm = 105 Pascal