# How are condensation and precipitation similar?

## Understand physics 3, textbook

41 Our life in a warm bath 3. In which situations can the air cool down and condense? There the drops collect (Fig. 41.1) E1, E4 Fill a large beaker approx. 3 cm high with hot (not boiling) water. Then place a matching crystallizing bowl with ice cubes on top. Observe the experimental setup for a few minutes. What does it show? The water vapor rises inside the beaker and condenses on the cool glass bowl. Water droplets are formed. Similarly, precipitation forms on cool window panes. If the water vapor in the air condenses into tiny floating droplets, there is fog and clouds. 4. How can raindrops form? The formation of raindrops was not clear in meteorology (weather and climate research) for a long time. For what is happening in our geographic latitudes, the following explanation is believed to be fairly accurate: 5. What is an ombrometer? Measuring devices that measure the amount of precipitation (rain, snow) are called rain gauges or ombrometers (Fig. 41.6). They are also a part of many weather stations. Simple rain gauges are cylindrical vessels that are open at the top and have an easily readable scale. How can you determine the amount of rain per m 2? You find out how often the area of ​​the ombrometer opening is contained in 1 m 2. For example, if the opening is 200 cm 2, it will fit 50 times in 10 000 cm 2 (1 m 2). Now you can multiply the amount of water by 50. Also important: If 1 liter of rainwater falls on 1 m 2 of soil, the amount of precipitation is 1 mm ( page 53, V32). V3 41.1 There the drops collect. 600m 500m 400m 300m 200m 100m + 10 ° C + 11 ° C + 12 ° C + 13 ° C + 14 ° C e.g. + 15 ° C 41.2 Cooling and condensation of water vapor when rising ice crystal water particles rain ice –15 ° C 0 ° C 41.3 The formation of raindrops • Moist air over lakes and meadows cools down at night through heat radiation. • Moist, warm air rises by itself, expands and cools below the dew point. • Moist wind is forced to rise by mountains and becomes colder in the process. • A moist, warm air mass cools down when it meets a cold air mass. M When raindrops form, water particles first attach themselves to ice crystals. When falling through warmer layers of air, the ice melts into water and drops are formed. M 41.4 Hail 41.5 Clouds form when warm and humid air rises and cools. 41.6 Ombrometer (rain gauge), 1mm on the scale ⩠ 1 liter of precipitation worksheets cg7f47 For testing purposes only - property of the publisher öbv