I think jam is sold by mass/weight rather than volume, but if you want to measure the volume, a typical jam/jelly jar is less than 1 liter, so use milliliters to measure volume.
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ml
A milliliter (mL)
Use the millilitre (ml)
Find the mass of an empty container using a balance. Fill the container with 100 ml of water and measure the mass again, The difference between the two measurements is the mass of 100 ml of water.
This cannot be sensibly answered. Milliliters (mL or ml) is a measure of volume, grams is a measure of weight or mass.