How many grams are in a uk teaspoon?

In the UK, a teaspoon is typically considered to hold about 5 milliliters of liquid. This volume is roughly equivalent to 5 grams of water. However, the weight in grams can vary for different substances due to differences in density; for example, a teaspoon of sugar weighs around 4 grams, while a teaspoon of flour may weigh about 3 grams.