What is the mass of one milliliter of water?

What is the mass of one milliliter of water?

• A. 0.9 gram
• B. 1 gram
• C. 1.1 gram
• D. 10 gram

Answer: (B)

Mass relates to how much stuff is packed into a given volume, through density. Water has a density of about 1 gram per milliliter, meaning each milliliter of water has roughly one gram of mass. Because density is mass per volume, multiplying by a volume of 1 milliliter gives a mass of about 1 gram. In fact, under the traditional definition tied to water at 4°C, 1 milliliter is defined as exactly 1 gram. So the correct takeaway is that a milliliter of water masses about one gram. The other numbers would correspond to densities quite different from that of water, which isn’t how dense water is.

Mass relates to how much stuff is packed into a given volume, through density. Water has a density of about 1 gram per milliliter, meaning each milliliter of water has roughly one gram of mass. Because density is mass per volume, multiplying by a volume of 1 milliliter gives a mass of about 1 gram. In fact, under the traditional definition tied to water at 4°C, 1 milliliter is defined as exactly 1 gram. So the correct takeaway is that a milliliter of water masses about one gram. The other numbers would correspond to densities quite different from that of water, which isn’t how dense water is.