The Greek scholar Hypatia of Alexandria is credited with inventing the hydrometer in the late fourth or early fifth century.
No one invented carbon, it was discovered.
Salinometer
Mrs.Tuft used a hydrometer to determine the specific gravity of a liquid
coal was discovered by two people digging and then they found coal so then they invented coal and discovered it
No one invented ferrous metal. It is iron (Fe) which is an element, this was discovered not invented.
The hydroscope (also called the hydrometer) is thought to be invented by Hypatia of Alexandria. If this is true, the first hydroscope was invented in the 4th century.
The hydrometer, which is used to measure the specific gravity of liquids. In 402 AD, the bishop Synesius of Cyrene sent a letter to Hypatia, asking her to construct a hydrometer for him. This is the first known reference to a hydrometer in history. It is not known when the hydrometer was originally invented.
it was invented when the earth was discovered
Although Hypatia could make hydrometers & astrolabes, she was not the one who invented them.
Hydrometer measure the density of liquids.
Sigma notation was invented, not discovered.Sigma notation was invented, not discovered.Sigma notation was invented, not discovered.Sigma notation was invented, not discovered.
It was not discovered but invented.
discovered
They were not discovered, they were invented.
It was not discovered but invented.
Discovered
It measured by the density of the size from the hydrometer.