because you are pushing air out of the space between the window and the suction cup
When you stick a suction cup on a window you force the air out of the suction cup and you create a high pressure vaccume keeping the suction cup on the window.
A partial vacuum between the compressed suction cup and the flat surface.
You can improve suction it by moisturizing it's edges, this makes it stick to something longer and stronger.
as we know that suction pump stick on a smooth non-porous surface but rough surface contains pores due to which suction pump is not able to maintain grip with the rough surface.
coz its kissing it
No. How well a suction cup sticks to a surface has to do with how will a seal can be formed on the surface. Rough surfaces will not form good seals compared to smooth surfaces which means that suction cups will not stick as well to rough surfaces as they do to smooth surfaces.
Nerf streamline darts do not stick to any surface. They are just a round rubber tip with no suction cup.
Cut a potato, rub the juice on the suction cup. This really does work. I don't know why.
Using suction.
No, a suction cup works by forcing air out of the space between it and the surface it's on. No air = no suction.
I wouldn't want my last suction cup to slip, just as I reach the top of the window. The geckos have a very clever suction cup design of the soles of their feet.