Soap Bubble Pressure Inside
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 bubbles 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 Z0 is :