Is there a way to convert grams to mililiters in medication ointments?

Question

I am traveling to Europe. New airline laws require only a maximum of 100 ml each fluid/gel medications to be carried on board. The several tubes of medication I recently got from my pharmacist are labeled either 15 grams or 30 grams, not in ml's. Since USA is WAY, WAY behind of using the metric system consistently, I have no idea if the 15 gram or the 30 gram tubes exceed the 100 mililiters limit. Can anyone help me? Thanks :)

Answer 1

It is tough because ointments are vehicles for other chemicals that have different specific weights (think 1 cubic mm of plastic vs. lead).

Generally I would think it is a good estimate to go with the weight of water where 1mL weighs 1 gram.

Answer 2

Consider the case of apples. You buy them by weight not volume. You do not purchase a liter of apples.....you buy a kilogram. It is the same with ointments. They are measured by weight not volume

So ease up on the "WAY, WAY" labelling until you understand it yourself.

For what it is worth. 1 gm of ointment has an approximate volume of 1 ml.