Calculate the vapour pressure that can help the formation of a spherical droplet of water of radius 6.25 10⁻⁵ m at 22°C. Given: The surface tension of water at the given temperature is 7.28 10⁻² Nm ⁻¹ .

Step-by-step solution

The excess pressure inside a spherical droplet that helps in its formation is given by the formula: P = 2T r where T is the surface tension and r is the radius of the droplet. Substituting the given values: T = 7.28 10⁻² N m ⁻¹ r = 6.25 10⁻⁵ m P = 2 7.28 10⁻² 6.25 10⁻⁵ P = 14.56 10⁻² 6.25 10⁻⁵ P = 2.3296 10^3 Pa P 2.33 10^3 Pa Answer: 2.33 10^3 Pa