why we provide curve shape at the bottom of the deo bottle

why we provide curve shape at the bottom of the deo bottle

how can dome shape resists the interior pressure ??

how can it provide structural support & hoe can it sit flat on a table.Can u give me the explanation.

The dome shape resists the interior pressure of the bottle using a thinner material. If you made the bottom flat, you would need a thicker material on the bottom to resist the pressure inside or the bottom would flex outward and your bottle would not stand up straight. You may also note that non-pressurized bottles with a manual pump are often flat but still thin on the bottom to save on material vs the dome shape.

Are you talk about a pressurized canister of deodorant ?

The concave end of those canisters are for structural support against the pressure with in the canister. They have to be depressed inward so the canister can sit flat on a table. The alternative would be to have a special added bottom piece which would be more expensive to produce.

Niel Leon
Community Developer – engineering.com

The stress in the material are a function of the pressure X the radius of curvature. The larger the radius of curvature the more the stress for a given pressure. A flat plate has a radius of curvature that is infinite. The resultant stress are very high, They cause the plate to flex or bow.

By starting with a curved or spherical plate the stresses are greatly reduced. With an inward facing dome it is in compression. With an outward facing dome the material is in tension.

Niel