The mystery of water
The mystery of water
Water is the source of life, and every drop of water is precious. Every drop of water contains millions of molecules, and water molecules contain smaller atoms. Two hydrogen atoms and one oxygen atom make up the compound, the water molecule. More than 70% of the earth is covered by water. The water gathers into rivers and lakes and sneak into the ground. Even the air we breathe has water. All living things need water so they can survive on this earth.
The tri-state water of water has three different forms, namely gas, liquid and solid. When water is in different environments, the state of water is different. In a standard atmospheric environment, water is liquid; when the temperature is 0 degrees Celsius or below 0 degrees Celsius, water is solid; when the temperature is 100 degrees Celsius or above 100 degrees Celsius, water becomes gas, that is, water Vapor.
The buoyancy of water We often find it easier to lift objects in the water than to lift objects in the air. I didn't understand it at the time. I also did a lot of experiments, but I still don't understand. I later read the Chinese Encyclopedia of Children and Adolescents. This is because the buoyancy of water is greater than the welfare of the air, and the object in the water is forced by the water to push it up. For example, a piece of wood does not sink in the water, but floats up, because the wood is more buoyant than the weight of the wood.
The pressure water of water is pressurized, and the magnitude of the pressure is related to the depth of the water. The fountain is a good example in our lives. The fountain is a phenomenon formed by the pressure of water. It can even spray several tens of meters. In modern times, the fountain is pressurized by a water pump and then ejected.
Nowadays, there are fewer and fewer fresh water resources, and there is a serious drought in China. Water is the source of life. If water is too much, it can be fatal. If there is less water, it can make people unable to survive. So let us save water and protect fresh water resources. !
Water is the source of life, and every drop of water is precious. Every drop of water contains millions of molecules, and water molecules contain smaller atoms. Two hydrogen atoms and one oxygen atom make up the compound, the water molecule. More than 70% of the earth is covered by water. The water gathers into rivers and lakes and sneak into the ground. Even the air we breathe has water. All living things need water so they can survive on this earth.
The tri-state water of water has three different forms, namely gas, liquid and solid. When water is in different environments, the state of water is different. In a standard atmospheric environment, water is liquid; when the temperature is 0 degrees Celsius or below 0 degrees Celsius, water is solid; when the temperature is 100 degrees Celsius or above 100 degrees Celsius, water becomes gas, that is, water Vapor.
The buoyancy of water We often find it easier to lift objects in the water than to lift objects in the air. I didn't understand it at the time. I also did a lot of experiments, but I still don't understand. I later read the Chinese Encyclopedia of Children and Adolescents. This is because the buoyancy of water is greater than the welfare of the air, and the object in the water is forced by the water to push it up. For example, a piece of wood does not sink in the water, but floats up, because the wood is more buoyant than the weight of the wood.
The pressure water of water is pressurized, and the magnitude of the pressure is related to the depth of the water. The fountain is a good example in our lives. The fountain is a phenomenon formed by the pressure of water. It can even spray several tens of meters. In modern times, the fountain is pressurized by a water pump and then ejected.
Nowadays, there are fewer and fewer fresh water resources, and there is a serious drought in China. Water is the source of life. If water is too much, it can be fatal. If there is less water, it can make people unable to survive. So let us save water and protect fresh water resources. !
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