But that difference becomes much more noticeable when you consider a gallon of milk, which in the US is 3,785 ml versus 4,546 ml in Britain. The difference in a teaspoon of vanilla would be hard to measure even if you tried.

For example, a US contemporary teaspoon is 4.93 ml compared to 5 ml in the Britisth Imperial System teaspoon. These differences are small when the amounts are small, but can really add up for larger volumes. Even within the US, there are differences between the US contemporary system and that used by the US Food and Drug Administration. To add to the confusion, these systems all use the same names, such as pints and quarts, to mean slightly different measurement amounts. Some English-speaking countries, including the United States, United Kingdom, and Australia, use measurement systems that originated from an old system called “English units”. Most countries use the metric system (officially known as the International System of Units), where every unit is defined using a measurable phenomenon, such as the distance light travels in a second. For other substances, the density will be different, and each teaspoon will weigh a different number of grams.

$units of liquid measurements$

Water has a density of 1 g/ml, so the conversion is 1 gram to 1 millileter, which is equivalent to 0.2 teaspoons. The correct conversion depends on the density of the item you're measuring. Grams are a measure of mass, and teaspoons measure volume. If you're looking for a grams-to-teaspoons conversion chart, you won't find one here.

Units of liquid measurements