liudr:
What range of specific gravity are you trying to measure? I am thinking about lowering a heavy object into the liquid (not touching the ground) and having a force gauge hold the string. Depending on specific gravity the force gauge reads different values.
Your weight does not touch the ground and you need to hold it with a string. A heavy object will not be affected by changes in the liquid voyancy which is what's being measured. Without the string it will sink. Once the object especific weight surpasses the espeific weight of the liquid it sinks. To do that the especific weights of the liquid and the object must be similar and that's exactly what they do with the gravity measuring bulbs when filling them with pellets of heavier metals. They are trying to match both to make the object float at a certain depth/ Soemting like subs. Please don't take me wrong we are just brainstorming here and we all learn from each other. That's all. Thanks 