Why bubbles can be formed using soap water but we do not have bubbles formed out of pure water?

Two air bubbles are formed in water (surface tension 0.72 N/m). The bubbles come together to form a bigger bubble. What will be radius and sense of curvature of common surface of that bubble? The radii of bubbles are 0.003 m and 0.005 m.

Tow soap bubbles A and B are formed at the two open ends of a tube. The bubble A is smaller then bubble B. If the valve on the tube connecting the two bubbles is opened and air can flow freely between the bubbles, then

Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations. (i) Bubbles of air came out from the bottle (ii) Some water entered the bottle. (iii) Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water. No bubbles formed, only water entered the bottle. Which observations is/are correct?

A soap bubble of radius r is formed inside another soap bubble of radius R (gt r) . The atmospheric pressure is P_(0) and surface tension of the soap solution is T. Calculate change in radius of the smaller bubble if the outer bubble bursts. Assume that the excess pressure inside a bubble is small compared to P_(0) .

If W is amount of work done in forming a soap bubble of volume V , then the amount of work done In forming a bubble of volume 2V from the same solution will be

Two soap bubbles of radii 1 mm and 2 mm merge isothermally . Then radius of the new bubble formed would be

On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If rlt ltR and the surface tension of water is T, value of r just before bubbles detach is: (density of water is rho_w )

Two air bubbles with radius r are present in water. Are these bubbles attracted or repelled?

The reason for shining of air bubble in water is