Mandy put the ice in the beaker. After a while, she saw water in the beaker, and there were many small drops of water on the outer wall of the beaker. She touched the outer wall of the beaker with her

Mandy put the ice in the beaker. After a while, she saw water in the beaker, and there were many small drops of water on the outer wall of the beaker. She touched the outer wall of the beaker with her hand. Mandy put the ice in the beaker. The temperature of the ice is lower than that of the air in the beaker. The ice absorbed heat and began to melt, so after a while, she saw water in the beaker.

The temperature of the beaker for putting ice cubes is low, and the water vapor in the surrounding air will release heat when it meets the cold beaker wall, which will liquefy into small water droplets, so there are a lot of small water droplets on the outer wall of the beaker.

Wipe the water off the outer wall of the beaker with paper. After a while, water droplets appeared on the outer wall of the beaker. The reason is that the water vapor in the surrounding flowing air meets the cold beaker wall and liquefies into small water droplets, which keeps the beaker wall temperature low.

The temperature of the hand is higher than that of the outer wall of the beaker. Touch the outer wall of the beaker with your hand, and the heat is transferred from your hand to the beaker, so Xiao Min feels cold.