1. When you blow over hot soup, the soup cools down because of the process of evaporation. As you blow air over the hot soup, the heat energy from the soup is transferred to the moving air. This causes the liquid particles on the surface of the soup to gain enough energy to escape into the air as water vapor. This phase change from liquid to gas requires energy, which is taken from the soup, leading to a decrease in the soup's overall temperature. So, blowing on hot soup helps cool it by promoting evaporation and carrying away heat.
2. Icebergs are often surrounded by fog because of the temperature difference between the cold iceberg and the relatively warmer air around it. When the cold surface of the iceberg comes into contact with the relatively warmer air, the air close to the iceberg cools down rapidly. This rapid cooling causes the moisture in the air to condense into tiny water droplets, forming fog. The temperature difference creates a layer of cold, moist air around the iceberg, leading to the formation of fog. This phenomenon is similar to how fog forms over cold surfaces like lakes or rivers on chilly mornings.
