open a can of coke , pour into a glass, why do the bubbles jump about 3 to 4 cm higher than the coke?

Answer 1

if you stick your thumb over the side of the glass it will break the surface tension and the bubbles wont go above the coke

Answer 2

Because the bubbles are the coke just carbonated if, you watch the glass for a moment you will notice that the bubbles disappear as the coke replaces it

Answer 3

Those aren't the bubbles you see, they're the remains of bubbles after they burst. The ones who happen to have exploded in a downward direction are the ones that reach the highest level above the surface.

Answer 4

They've built up speed from the bottom of the glass and erupted.