What equals a teaspoon?

A teaspoon can equal a few things, depending on what you're measuring and where you are:

Volume:

* Metric: 1 teaspoon (tsp) = 5 milliliters (ml)

* US customary: 1 teaspoon (tsp) = 4.93 milliliters (ml)

* This is often rounded to 5 ml, but it's not technically accurate.

* UK: 1 teaspoon (tsp) = 5.91 milliliters (ml)

Weight:

* US customary: 1 teaspoon of sugar = approximately 4 grams

* US customary: 1 teaspoon of salt = approximately 6 grams

Important Note: The actual weight of a teaspoon will vary depending on the density of the substance being measured.

Let me know if you have a specific substance in mind, and I can provide a more precise answer.