Converting Grams to Milliliters for Cosmetic Ingredients
Question
How can I convert grams (g) to milliliters (ml) for cosmetic ingredients? I have a list of ingredients with weights in grams (e.g., Substance A-G, and Water at 84g which I calculated as 90.60ml). Is it correct to convert them directly, or how should I calculate the volume from the weight?
Answer
Hello,
Regarding your question and the staff's reply, converting units from grams (g), which is a unit of weight (mass), to milliliters (ml), which is a unit of volume, cannot be done directly for most substances.
The reason is that each substance has a different density. Density is the ratio of mass to volume (Density = Mass / Volume). Therefore, to accurately convert from grams to milliliters, you must first know the density of each substance and then use the formula Volume = Mass / Density for calculation.
As the staff mentioned, only pure water has a density approximately close to 1 g/ml, allowing us to estimate that 1 gram of water has a volume of approximately 1 milliliter.
Looking at the numbers you provided:
- Substances A-G: Your conversion from grams to milliliters did not use the correct density values for each substance, so it is incorrect.
- Substance H (Water): You stated that 84 grams equals 90.60 milliliters, which does not align with the principle that 1 gram of water is approximately equal to 1 milliliter. This indicates that the calculation for water is also not correct according to this principle.
In summary, your calculation for converting grams to milliliters is incorrect because it did not consider the density of each substance, which is a crucial factor in converting between weight and volume.
If you want to know the correct volume of each substance from the known weight, you need to find the density information for each substance and then calculate using the formula Volume (ml) = Weight (g) / Density (g/ml).