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The rest mass of a photon is zero.
Liter
A metric unit of volume equivalent to 1,000 cubic centimeters or about 0.26 gallons.
Household Measurement
A system of units used in everyday domestic tasks, such as cooking and home repair, often including tablespoons, cups, meters, and feet.
Ounce
A unit of weight in the avoirdupois system, equivalent to 28.3495 grams, commonly used in the United States and the United Kingdom.
Household System
A system of measurement that includes drops, teaspoons, tablespoons, ounces, cups, pints, quarts, and gallons.
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