Question

A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is :

Answer 1

Answer:

1 cm

Explanation:

Given A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is

We know that Guage pressure = ρgZo and excess pressure = 4 T /R

k + 4 T/R = k + ρ g Zo

4 T / R = ρ g Zo

Zo = 4 T / R ρ g

Zo = 4 x 2.5 x 10^-2 / 10^-3 x 1000 x 10

Zo = 10^-2

Zo = 1 cm

Answer 2

Answer:

Explanation:

remember the gauge pressure .