### What is the difference between weight and volume?

But a pound of brick is denser than a pound of feathers, and each one will look quite different

VOLUME is the space something takes up

Measuring by weight is more accurate

Consider castor oil compared to avocado oil 16 ounces of each will not weigh the same on the scale because castor is a much heavier oil

Advantages of measuring weight versus volume

It is more accurate, saving time and money

Ensures consistent results so every batch is the same

Eliminates the need for measuring utensils such as teaspoons, tablespoons and cups

Allows you to measure directly into one bowl using the container function, speeding up time and cleanup

It’s easier to scale a recipe by adding or subtracting ingredients as needed for each customized batch

### Why is weight more accurate, you ask?

Because measuring cups and spoons are surprisingly inaccurate and can vary widely

Even worse, many inaccuracies creep into the recipe depending on what is measured and how you package the ingredients

For example, dipping into a box of cornstarch may have different measurements than spooning it because it may be packed differently into a cup

My cup of cornstarch on one batch probably won’t be the same as the next batch

Let’s say I pack a cup of cornstarch and the resulting amount by weight is 155 grams

Then I pack again for another batch but end up with 130 grams (25 gram difference)

### That might not sound like much, but what if the recipe calls for 4 cups?

Often, when you measure by volume, the final weight of all components can be reduced by up to 10 percent or more

When dealing with soap making and cosmetic formulas, we’re dealing with chemistry, so it’s best to be as precise as possible for consistent results

In the US we use ounces and pounds, but we use almost the same terminology for weight and volume

For example, you might have 4 ounces of wax (weight) and 4 fluid ounces of almond oil (volume)

Looking at this in a real life scenario really shows the difference

Here are two photos of items that weigh the same

This is a net weight of 16 ounces

dried rose petals and buds behind 16 oz net weight

And for more detail, here are some examples of oils filled by weight into a container of the same size

Heavier oils like castor oil have a higher density (require less volume or space) than sunflower oil