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What is the boiling point of water in space? Replies: The boiling point of water is fixed by its temperature, and the vapor pressure of water at that temperature. So for example, if the water is at 100 C. the boiling point is 100 C. at a pressure of 1 atm (which is equal to 760 mm of Hg).
At room temperature, 22 Celsius, water has a density of 0.9977 g/ml. The water molecule has a molar mass of 18.01528 g/mol. Avogadro's number for a gram-mol is 6.022E23 particles per mol. Hence the six answers: At 4 Celsius: A US tablespoon of water will contain 4.943E23 molecules of water. A metric tablespoon will contain 5.014E23 molecules of water.