A lactometer is a type of hydrometer. It is a device that measures the purity of milk, and it operates based on the gravity of milk.
- The lactometer comprises a long calibrated test tube with a cylindrical bulb with a graduation of \(15\) \(cm\) at the top and \(45\) \(cm\) at the bottom.
- The test tube is completely filled with air. This air chamber causes the device to float when it is placed in the milk.
- In addition, the spherical portion of the bulb is filled with mercury to make the lactometer to sink up to the proper level and float in an upward position in milk.
- A thermometer is placed inside the lactometer, which extends from the bulb into the upper portion of the test tube where the scale is located.
- A proper lactometer reading be achieved only at a temperature of \(60\) degrees Fahrenheit. A lactometer is an instrument that measures the amount of cream present in milk.
- The lower the lactometer floats in the milk, the more cream there is.
- Quality milk has an average reading of \(32\).
- Lactometers are used in the milk production process.
Testing the purity of milk