The viscosity of a fluid is basically a measure of how sticky it is. Water has a fairly low viscosity; things like shampoo or syrup have higher viscosities. Viscosity also depends on temperature: engine oil, for instance, is much less viscous at high temperatures than it is in a cold engine in the middle of winter.
One small packet of 7 grams will produce about 500 grams of beads once they are hydrated. Soak overnight to a ratio of one packet of beads to 50 parts water. You can add more water or pour out any extra water when the beads expand. They can also be used to water potted/garden plants and flowers.
If necessary, use measuring spoons and make a note of how much water you add. Calculate the weight of the quantity of water you added. One cup of water weighs 236.59 grams, so divide this number by the fraction of a cup of water you needed to balance the makeshift scale. Thus, if you added a half a cup of water, the jewelry weighs 118.3 grams or 4.17 ounces. Online Conversion: Water Weight.