3/12 = 1/4 so just one.
A teaspoon
A teaspoon
A teaspoon
A teaspoon
You should place it on a napkin or saucer plate.
five
Roughly 2.3 grams of activated charcoal in 1 tsp. Please note I used a plastic picnic-style teaspoon rather than a commercial cookery teaspoon.
1/8th teaspoon. The pinch was used to describe a very tiny amount. This would approximate to 1/8th teaspoon in today's measurements.
It depends on the size of the teaspoon!- but a teaspoon as used in cookery recipes in the UK and Europe is defined as 5 mls, so the weight is very close to 5 grams.
it is 15 ml of water.
A teaspoon is used as a unit of volume, not weight. A teaspoon is 5 milliliter (5 ml). Actual teaspoons may contain more or less; the "5 ml" is for a teaspoon as used in cooking recipes.
Around a teaspoon of butter. It's not a standardised unit of measurement, so your own judgment should be used as to what is appropriate.