Cubic Millimeters
A cubic millimeter is the volume of a cube 1 millimeter on each side, so 1,000 of them make a cubic centimeter. It is the same as a microliter, and a drop of water is roughly 50 cubic millimeters.
US teaspoons
A US teaspoon is a measurement used in the United States for cooking and baking. One US teaspoon is about 4.93 milliliters.