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What is the boiling point of water in degrees Celsius?
A. 90 degrees
B. 100 degrees
C. 110 degrees
D. 120 degrees
Correct Answer Is Option = 100 degrees
Notes / Explanation
The boiling point of water is one hundred 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. Boiling is the process by which a liquid turns rapidly into a gas or vapour when it is heated to a certain temperature, and for each liquid there is a particular temperature at which this happens, which is called its boiling point. For water, this temperature is one hundred degrees Celsius under ordinary conditions, meaning that when water is heated to this temperature it begins to boil, turning rapidly into steam. The Celsius scale of temperature, on which this is measured, is a widely used scale in which the boiling point of water is set at one hundred degrees and the freezing point of water is set at zero 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. It is important to note that the boiling point of water is one hundred degrees Celsius under ordinary conditions, that is, at the ordinary pressure of the air at sea level, but that the boiling point can change if the pressure changes. At high altitudes, such as on high mountains, where the pressure of the air is lower, water boils at a temperature lower than one hundred degrees, which is why cooking can take longer at high altitudes, whereas under increased pressure water boils at a higher temperature, which is the principle used in pressure cookers to cook food more quickly. The boiling point of water is a familiar and important fact in everyday life, in cooking, and in many applications, as well as being a fixed reference point used in the measurement of temperature. The study of temperature, its measurement, and the boiling and freezing of substances is an important part of science. For PPSC and other competitive examinations, the key points to remember are that the boiling point of water is one hundred degrees Celsius under ordinary conditions, that boiling is the rapid change of a liquid into a gas at a certain temperature, that on the Celsius scale the boiling point of water is set at one hundred degrees and the freezing point at zero degrees, and that the boiling point of water changes with pressure, being lower at high altitudes and higher under increased pressure.
