Question

what is the answer of this question no.8

Answer 1

we density of air is 1.225 kg/m3

Relative density = density of substance/density of air

Relative density of air = 1.29 kg/m³/1.225 kg/m³

Relative density of air = 1.05 (approximately)

Relative density doesn't have unit

(Example of water 1000kg/m³ use same formula to find the Relative density of liquid)