Measuring small quantities of liquids like vanilla extract or spices like salt by volume (teaspoon or tablespoon) is often more practical and just as accurate as weighing them, especially in home cooking where precision isn't critical and kitchen scales may not be readily available.
While weight is generally considered more accurate for measuring ingredients, there are situations where volume measurements are perfectly acceptable and even preferable. This is often the case when dealing with:
Small Quantities: For ingredients used in very small amounts, such as spices (salt, pepper, cinnamon) or flavor extracts (vanilla, almond), the difference in weight between a slightly heaping or slightly scant teaspoon is negligible in the overall recipe. Using measuring spoons is quick and convenient.
Liquids with Consistent Density: For liquids like water or milk, volume measurements are generally reliable. While density can vary slightly with temperature, the impact on most recipes is minimal.
Ingredients Where Exact Precision Isn't Critical: In many home cooking scenarios, slight variations in ingredient amounts won't significantly affect the outcome. For example, a tablespoon more or less of coarsely chopped vegetables in a soup or stew is unlikely to ruin the dish. The convenience of using a measuring cup outweighs the marginal increase in accuracy from weighing.
When Equipment is Limited: Not everyone owns a kitchen scale. Relying on volume measurements allows more people to access and enjoy cooking and baking.
In these scenarios, the convenience and speed of volume measurements often outweigh the slight potential loss of accuracy compared to weighing.
When measuring dry ingredients by volume, avoid packing them into the measuring cup or spoon unless the recipe specifically instructs you to. Gently spoon the ingredient into the measuring container and level it off with a straight edge (like the back of a knife) for more consistent results.