Question

State true or false.

$1$ ppm is equal to $1$ mg per kg.

• A. True
• B. False

Answer 1

The correct option is A True

ppm means part per million, which is 1 mg per kg.

Considering the weight of 1L (approximately = 1kg) depending on the density of the solution (water, for example, has a density of 1 at ${25}^{\circ }C$)

So, 1L of water = 1 kg. If you dissolve 1 mg of substance in 1L of water, concentration becomes 1 ppm.