What is the difference between rain and dew?

Although rain is water droplets condensed by water vapor in the air, there is a very important condition for condensation, that is, every drop of rain must find a tiny dust as its core, so that water vapor can attach to it to form water droplets. Dust is like the core of a fruit, and this conclusion can be confirmed in the laboratory. An absolutely clean bottle, after sealing, will not condense into water droplets even at a proper low temperature. In addition, raindrops will be contaminated with a lot of dust when they fall. There are many bacteria in the dust in the air. According to laboratory tests, there are100000 bacteria in a cup of rainwater, some of which can make people sick. For the sake of safety and hygiene, it is best not to drink rainwater. If you must drink rainwater, you should boil it before drinking it.