8.1 surface tension 1. 4 Measurement of surface tension: Slide l I. capillary rise I 2. maximum bubble pressure Soap film 3. ring method A=2ldx 4. drop weight method 5. Wilhelmy slide method 6. the shape of drops or bubbles 7. flow method 8. capillary waves method, etc. W=oA=2oldx W= fdx 2l1. capillary rise 2. maximum bubble pressure 3. ring method 4. drop weight method 5. Wilhelmy slide method 6. the shape of drops or bubbles 7. flow method 8. capillary waves method, etc. 1.4 Measurement of surface tension: Slide l Soap film A = 2ldx −W =A = 2ldx W = Fdx l F 2  = 8.1 surface tension