The diameter of a soap bubble with has an inside pressure of 2.5 N/m² over the atmospheric pressure and a surface tension of 0.0125 N/m is
- A. 40 mm
- B. 4 mm
- C. 16 mm
- D. 60 mm
Answer: A. 40 mm
Explanation: P = 8*sigma / d. d = 8*0.0125 / 2.5 = 0.04 m = 40 mm.