De que é feito hydrometer
A float with a scale: the denser the liquid, the higher it floats. It is used to measure the density of milk, syrup or battery acid.
- Mercury — tem como parte. Old hydrometers used mercury or lead shot as the weight to keep them upright.
- Princípio de Arquimedes — utiliza. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
- Glass — é feito de. A glass tube with a weight at the bottom and a scale at the top.