Water in the Atmosphere

A pipe of diameter D is connected to a water tank of large cross-sectional area in which water is maintained at a height H as shown in the figure. A nozzle of diameter 'd' fitted at the end of the pipe discharges water into the atmosphere. Find the flow rate, given that the density of water is p . Also find pressure at point C . ( P_(0) is the atmosoheric pressure)

Figure shows a capillary tube of radius r dipped into water. If the atmosphere pressure is P_0 , the pressure at point A is

Many salts absorb water from the atmosphere.This property is called

Which forms the nuclei for condensation of water vapours in the atmosphere?