So surface tension increases as the length increases. I know that. But what doesn't make sense is if I have a bucket of water, and then suspend a needle on the top. The surface tension of the water should act like a 'membrane', the needle will then float on the top of the water. If I later add some soap to the bucket of water, the needle will sink because the surface tension of the fluid has been reduced.
My question is then, why can I not blow bubbles with pure water?