Which excess-pressure relations are correct for interfaces of surface tension S?

Select all that apply

• Option A

  For a spherical liquid drop, ΔP = 2S/R.

• Option B

  For a spherical air bubble inside a liquid, ΔP = 2S/R.

• Option C

  For a spherical soap bubble, ΔP = 4S/R.

• Option D

  For a single curved interface, ΔP = S(1/R₁ + 1/R₂).