Water

Water的思维导图，内容有Introduction to Water、Physical and chemical properties、Physiological significance、The Origin of Water、Water pollution control.

water

• Introduction to Water
  • Water (chemical formula: H2O) is a inorganic compound composed of hydrogen and oxygen, non-toxic and drinkable. It is a colorless and odorless transparent liquid at room temperature and pressure, known as the source of human life and an important substance for maintaining life, also known as hydrogen oxide.
• Physical and chemical properties
  • Water is a colorless, odorless, and odorless liquid at room temperature. Under standard atmospheric pressure, the boiling point of pure water is 100 ℃, and the freezing point is 0 ℃.
• Physiological significance
  • Water is an essential substance for normal metabolism in the human body. Under normal circumstances, the body needs to excrete about 1.5L of water through the skin, viscera, lungs, and kidneys every day to ensure the excretion of toxins from the body. Children have 80% water in their bodies, elderly people have 50% to 60%, and normal middle-aged people have 70% water.
  • The Important Function of Water in the Body
    • (1) Water is an important component of cell protoplasm
    • (2) Water acts as a solvent in the body, dissolving various electrolytes
    • (3) Water plays a transportation role in the body and can transmit nutrients, metabolic waste, and endocrine substances (such as hormones)
    • (4) Water has high thermal conductivity and specific heat, and can act as a "heat carrier" to transfer heat between the body and the surface of the skin, helping to regulate body temperature.
• The Origin of Water
  • There are many different understandings and reasons about the source of water on Earth, but the truth remains to be solved by scientists collecting more objective evidence. As is well known, 72% of the Earth's surface is covered by water. However, where the water on Earth comes from remains an unsolved mystery.
• Water pollution control
  • In order to strengthen water resource protection and prevent damage, waste, and serious pollution of water resources, it is necessary to strengthen water resource protection work and take timely and effective measures to comprehensively protect water resources.