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What is the freezing point of water in degrees Celsius?
A. 0 degrees
B. 4 degrees
C. 10 degrees
D. 32 degrees
Correct Answer Is Option = 0 degrees
Notes / Explanation
The freezing point of water is zero degrees on the Celsius scale of temperature, under ordinary conditions, and this is one of the most basic and important facts in the study of heat and temperature. Freezing is the process by which a liquid turns into a solid when it is cooled to a certain temperature, and for each liquid there is a particular temperature at which this happens, which is called its freezing point. For water, this temperature is zero degrees Celsius, meaning that when water is cooled to this temperature it begins to freeze, turning into ice, and conversely, ice begins to melt back into water when it is warmed above this temperature, so that zero degrees Celsius is both the freezing point of water and the melting point of ice. The Celsius scale of temperature, on which this is measured, is a widely used scale in which the freezing point of water is set at zero degrees and the boiling point of water is set at one hundred degrees, with the range between them divided into one hundred equal parts or degrees. This makes the Celsius scale convenient and easy to understand, since these two important points relating to water are set at the round numbers of zero and one hundred, and temperatures below the freezing point of water are expressed as numbers below zero. The freezing of water is a familiar and important phenomenon, seen in the formation of ice in cold weather, the freezing of ponds and lakes, and the making of ice, and it has an interesting and important feature, which is that water expands as it freezes, so that ice takes up more space than the water from which it formed and is less dense, which is why ice floats on water. This unusual property of water has important consequences in nature. The freezing point of water is a fixed reference point used in the measurement of temperature. The study of temperature, its measurement, and the freezing and boiling of substances is an important part of science. For PPSC and other competitive examinations, the key points to remember are that the freezing point of water is zero degrees Celsius, that freezing is the change of a liquid into a solid at a certain temperature, that on the Celsius scale the freezing point of water is set at zero degrees and the boiling point at one hundred degrees, and that water expands as it freezes so that ice is less dense than water and floats on it.
