Which principle is used in Lactometer?

Which principle is used in Lactometer?

Archimedes Principle
Archimedes Principle is used in lactometers which are used to determine the purity of milk. Archimedes Principle states that the body submerged (partially or fully) in a fluid will be buoyed (afloat) up by force equal to the weight of the fluid displaced.

What is the correct reading of Lactometer?

Normal milk has a density of 1.026 -1.032 g/ml (or 26 – 32 on the lactometer reading). If water has been added, the lactometer reading will be below 26. If any solid such as flour has been added, the reading will be above 32. There are other advanced tests that are beyond the scope of this course.

What are the two type of Lactometer?

The quevenne lactometer – designed to determine the specific gravity of milk at 15.5ºC (60ºF). Zeal Lactometer – designed to determine the specific gravity of milk at 29º C at 84º C. The Watson lactometer – is applied at a temperature of 39ºC. ISI lactometer calibrated at 27ºC is used.

How do you test the water level in milk?

A lactometer is an instrument that is used to check for the purity of milk by measuring its density. An instrument to find out the content of the water in the milk or to test the richness of the milk is thus termed as ‘lactometers’.

Why does Lactometer float on milk?

The lactometer works on the principle of gravity of milk. The lactometer consists of a long graduated test tube with a cylindrical bulb with the graduation ranging from 15 at the top to 45 at the bottom. The test tube is filled with air. This air chamber causes the instrument to float.

How is Lactometer measured?

Procedure of lactometer test:

1. Adjust the milk temperature to near (15.5) ˚C or (60 ˚F).
2. To mix the milk, but to avoid incorporating air.
3. Place enough milk in the jar so that as the lactometer floats.
4. Centre the lactometer in the cylinder and within 30 seconds after mixing read to the top of the milk meniscus.

How Lactometer uses Archimedes principle?

lactometer works on the principle of Archimede’s principle that a solid suspended in a fluid will be buoyed up by a force equal to the weight of the fluid displaced. If the milk sample is pure, then the lactometer floats on it and if it is adulterated or impure, then the lactometer sinks.

How do you check milk in Lactometer?

1. Step 1- Whenever you want to test the milk purity, you just put the lactometer in milk.
2. Step 2- If it sinks up to the mark ‘M’ which is mentioned in the lactometer that means milk is pure or if not that means milk is impure.
3. Step 3- If the milk is mixed in water then it would sink higher than the mark ‘M’.