That's condensation—the water vapor in the air around the cup condenses on its surface because it's cold. So it comes from the air around the cup.
Water vapor is invisible to the naked eye because it consists of individual molecules dispersed in the air. However, when water vapor cools and condenses into tiny liquid water droplets, it becomes visible as clouds or fog.
The water in the outer cup likely came from condensation due to the temperature difference between the cold inner cup and the warmer room temperature. As the air inside the cup cools down, the moisture in the air is released and condenses on the outside of the cup.
the candle light turns off when the cup is placed over the candle and water rushes in due to atmospheric pressure . when cup is placed on the candle all the air goes out and the glass lifts up due to the atmospheric pressure releases from outside of the cup as there is no air inside to balance the pressure exerted out of the cup . thus when the glass lifts up and the water gets into the cup .
The cup of water will heat up faster than the cup of sand because water has a higher specific heat capacity, meaning it requires more energy to increase its temperature compared to sand. Sand, being a solid, has a lower specific heat capacity and will heat up more quickly.
rain
yes.
the main reason is condensation of water vapour in the air to water droplets
Water droplets form on the outside of a glass cup when the air around the cup is cooler than the temperature of the water inside. This causes the warm, moist air in the cup to come into contact with the cooler air, leading to condensation and the formation of water droplets on the outside of the cup.
Condensation
The hot heat from the hot water turns evaporates. Once it reaches or touches a cool surface (mirror), the heat would condense and turn into water droplets. Therefore, water droplets are found in the mirror when you bath.
Assuming the glass cup held a cold liquid, the air closest to the cup will be colder than the surrounding air, causing water vapour in the air to condense into liquid water droplets.
Your question is imprecise - we do not get the point of what you are asking. Water droplets can be found on the outer surface of a cup if it has just been washed!
The water on the outside of the cup is an example of condensation.
Water droplets form on the inner wall of a covered cup of hot water because the air inside the cup becomes saturated with water vapor from the evaporating hot water. When the air cools against the cooler walls of the cup, it cannot hold as much water vapor, causing the excess moisture to condense and form droplets.
Condensation can only occur on a glass that is cold. The reason why condensation forms is because water vapor in the air (a gas) cools and turns into liquid water when it comes into contact with a cold surface.
a condensation of water will form on the outside of the metal container. What really happens is the frigid temperature of the cup actually cool the air down that it comes in contact with and water droplets form.