20 mL is around 4.058 teaspoons, so no it's not 1½ teaspoons.
A whole teaspoon is twice as big as a half teaspoon.
A teaspoon and a half, or 7.39 milliliters
1 milliliter equals 0.202 US teaspoons. 1 teaspoon is 4.928 milliliters
2.5 milliliters or half a teaspoon
That is 2.5 ml.
No 1 milliliter equals 0.202 US teaspoons. 1 teaspoon is 4.928 milliliters
2.46 milliliters 1 milliliter equals 0.202 US teaspoons. 1 teaspoon is 4.928 milliliters.
A level teaspoon is 5 ml. So a half teaspoon is 2.5 ml
One-half teaspoon is approximately 2.5 milliliters. The milligrams in one-half teaspoon will vary depending on the substance being measured, as milligrams measure weight and milliliters measure volume.
There are about 5 milliliters in a teaspoon.
One teaspoon is equal to five millilitres, so 0.5, or half, a teaspoon is 2.5ml.
7.39 ml 1 milliliter equals 0.202 US teaspoons. 1 teaspoon is 4.928 milliliters