How to explain the relationship between water, clouds, rain, snow and hail to primary school students

It can only snow in places where the weather is very cold and the temperature is mild. It's cold, but if the air is dry, it won't snow. So it can only snow in places where the weather is very cold and the climate is humid.

There is a lot of water vapor in the air. When the water vapor in the air meets the temperature below zero, it will form ice crystals. Ice crystals are very small. When they float in the air, they will become bigger and bigger and become snowflakes when they meet water vapor. Because ice crystals are hexagonal, snowflakes formed by ice crystals are also hexagonal. If white clouds in the sky meet cold air, small water droplets in the clouds will collide with each other. The volume will get bigger and bigger. When the rising airflow can't hold them, it will fall from the clouds to form rain. If the temperature is very low, small water droplets will become small ice crystals, so what falls from the clouds is snow or hail. When the air temperature in the sky drops below zero, if the zero degree is higher than 0 degrees, the water vapor in the air condenses into small water droplets on the dust, which is the cloud, and the larger water droplets are the rain. If the zero degree is lower than 0 degrees, the water vapor in the air will directly condense into snow on the dust. Through this study, we learned the mystery of rain, snow and hail and mastered many skills. In the future, we must know more about the mysteries of nature.

Peter Agre, winner of the Nobel Prize in Chemistry in 2006, cracked the human health code and discovered the water channel of human cells. Scientists and medical scientists all over the world assert that the future diseases, health and longevity of human beings can not be solved only by drugs and food, because everyone ignores the understanding of water, the most important healthy element in our bodies.

The question of what water modern people often drink is not only a personal behavior, but also relates to the health and prosperity of families, the safety and health of people around them, the physical quality of hundreds of millions of people in China, and the national economic and social development.

Seven standards of healthy water

First, raw water does not contain toxic, harmful and odorous substances;

Second, the hardness of water is moderate;

Third, the content of minerals needed by human body is moderate and the proportion is scientific;

Fourth, the PH value is neutral or weakly alkaline;

5. The content of dissolved oxygen and carbon dioxide in water is moderate;

Sixth, the water mass is small;

Seven, the physiological function of water is strong;