While we drink the water through straw we suck the air inside the draw. While we suck it some air inside the draw comes up to our mouth and there is less amount of air inside the straw in more space. So the pressure of the air is decreased inside the straw. While there is a difference in pressure the atmosphere tries to balance it. So the air outside the straw which is at high pressure tries to enter into the straw and so it pushes the water on the surface of the container. This makes the water to go inside the straw.
The earthen pot contains small pores. The water tries to go out through this holes but it gets evaporates on the outer surface of the pot. For the water to change from its liquid to vapour state it needs energy. This energy is taken from the remaining water inside the earthen pot as heat energy. So the water inside the earthen pot gets cooled.
If the tea is poured in a plate the tea will be cooled fast. But if it is in glass then it will cool slowly. From this we can understand that the surface area of the tea is less in the glass and the surface area is more in the plate. So the heat transfer easily takes place where there is more surface area. So to increase the surface area we make the hot tea poured from higher distance to lower distance and the tea cools fast.
Always the outside air contains some water in the invisible state (Gaseous State).When the cool drink or water bottle cools the outside air, the outside air gives some water in the visible state (Liquid State). The water from the outside air stays outside the bottle and looks like the bottle sweats.
There are seven colours in white light which is emitted by the sun. When the light travels through the atmosphere it scatters. That means the seven colour scatters. If a colour (Red) has long wavelength it scatters after traveling a long distance. If a colour (Violet ) has short wavelength it scatters after traveling a short distance. Blue colour has medium wavelength. When the sun is above our head (afternoon ) the distance in which the blue colour scatters is in our atmosphere. So we see the sky as blue in colour. When the sun is long (sunset ) the distance in which the red colour scatters also is in our atmosphere. So we see the sky near the sun as red in colour.