A hydrometer is an instrument used to measure the specific gravity of a liquid. Specific gravity is the ratio of the density of a liquid to the density of water. The scale on the side ranges from 1.0-2.0 in .01 divisions.

What You Get

One hydrometer.  Dimensions: 30cm.  Mass: 9g

Teach

• Density
• Specific gravity

How it works

Fill a tall container, such as a measuring cylinder, about three-quarters full of the liquid you wish to test. Place the hydrometer gently into the container, bulb first. Give it a little spin to dislodge any bubbles. When it comes to rest, read the specific gravity from the scale.