纯水是一种无色、无味、无臭的透明体．在一大气压下，纯水的凝固点（冰点）是０℃，沸点是１００℃．水具有几种特殊物理性质：在所有固态和液态物质中，水的比热最大；和绝大多数物质的密度随着温度的降低而增大的情况不同，水的密度在４℃（严格讲３．９８℃）时最大；和绝 Pure water is a colorless, odorless, odorless transparent body. At an atmospheric pressure, the freezing point (freezing point) of pure water is 0°C and the boiling point is 100°C. Water has several special physical properties: in all solid and liquid materials, the specific heat of water is greatest; and the density of most substances varies with the decrease of temperature, and the density of water is at 4°C (strictly speaking, Maximum at 3.98°C);