why r gas cylinders round?
349292
They are round because that shape can withstand the most amount of pressure without exploding/collapsing. The shape is also called a pressure vessel.
1123910
Only "large" celestial objects are round. Small ones, like asteroids, can be any shape.\n\nIt is the high gravity of large objects that makes them round. As they accumulated from smaller pieces, any piece that was out of round was pulled by gravity "downhill" so the overall shape of the body is round.
820312
Because air preasure is distributed evenly and in all directions. Notice that if you blow on a bubble it changes shape temporarily, but only as long as the preasure on it is from one side. After you stop blowing it returns to perfectly round.
276632
Gosh!  They are unlimited.  A simple cup, a simple cylinder, a funnel. those are just some symmetric shapes.
946245
Here you are (nice circles and atoms and stuff):\n\nhttp://www.uwgb.edu/dutchs/PETROLGY/ScaleAtomsCsRn.HTM
943088
Depends on the head type...unless you need to be extremely exact assuming 1/2 the vessel diameter is pretty good(i.e. a semi-elliptical or 2:1 head).\nKeep in mind though that pressure vessel heads have some straight-side to them when they are manufactured and the way I understand it is this amount is determined by the equipment manufacturer.
23108
The number denotes the number of cylinders. The "V" means that the cylinders are arrayed in 2 banks, usually at an angle of 90 degrees to one another, though the angle can be narrower (say, 60 degrees). A V8 has 4 cylinders in each bank, and 6 in the case of a V12. With 8 cylinders, a cylinder fires every forty-five degrees of crankshaft turn (360/8). In a V12, 1 cylinder fires with every 30 degrees of turn. (Crankshaft is what the pistons are connected to; the up and down motion of the pistons is converted to spinning by the crankshaft). The reason why a V12 of equal size (say, 5 liters) as a V8 generates more power is that cylinders are firing more frequently (30 versus 45 degrees). Thus, there is less 'coasting' in the crankshaft. V12's have a distinctive engine note, as do V8's. V12's are, of course, rarer, and the higher complexity and size mean that they are restricted to supercars and highest-end Mercedes and BMWs: both companies offer 6.0 liter V-12's generating in excess of 450 horsepower.
644793
There would have to be a compelling reason to make wheels that are not round.  If wheels were triangular or square, the ride would be very uneven and bumpy.  Oval wheels would be smooother but still bumpy.  If many sides were used (perhaps a hexagon or more) on the tires for use on a smooth surface, they would cause severe vibrations.  Wheels need not be round if the surface traveled on is not smooth and mates with the new shape, but the extra cost would have to be justified by a new advantage.
57491
because of gravity, pulling inward with the same force in all directions, giving them a round shape.\n\nyou look very pretty in your avatar by the way ;)
1041151
THe constant movement and friction of the piston rings against the walls of the cylinder(or Liner) causes wear over a period of time even with the lubrication of fluids. when you hone the cylinder it removes all scratches and imperfections in the cylinder and helps make it round again. After honing you may need to go to an oversized set of rings or piston.
469675
Planets came from clouds of spinning gases that later solidified.   So they are pretty round, but not exactly spherical.  The earth is around 8,000 miles in diameter.  Black holes are proven.  They were proven using gravity experiments on nearby bodies and light experiments from stars "behind" them when viewed from earth.
272850
it sounds like you are trying to find out about pipe connections or tubing?if this is so .you can obtain a pipefitters bluebook and it will give you all infomation on tubing and pipe and take offs and math to figure problems of different types with round pipe or tubing?i hope thats close for you.you can go to a libary and see drawings of local buildings and there are detailed.but take offs and such you have to figure.the blue book gives it all
64442
Planets are round because they have enough gravity to cut down elliptical or uneven parts in a sphere.
885093
If the inside is pressurized, the shape has to symmetrical in such a way, that will make the internal pressure distribute itself more or less equally. Else the can may burst where the pressure is more.\nAlso the shape has to have a logical design.\nFor the sake of argument, let us consider others shapes.\n\nSpherical:: well that's not possible. Not very easy to hold !!\nBut yeah, from the physics point of view, its the ideal.\n\nCube and Cuboid :: The corners present can cause unequal pressure distribution, also the strain present may give rise to corrosion.\n\nElliptical:: no comments !!
483817
Because they started as gas/liquid, and round is the lowest energy state for a liquid.\n\nLike a raindrop.
1089145
No, planets and stars are round because of gravity (to be more accurate, gravity is the curvature of space-time). This is a caused by a different phenomena than surface tension, which is due to the electromagnetic attraction between water molecules. The force of gravity and the electromagetic force are two different forces.  \n\nSurface tension does not actually make the drop round; air pressure does that.  Surface tension simply gives the drop an outer wall like the wall of a balloon.  \n\nThe reason that water drops form into spheres is the need to equalize the pressure inside the drop. Air pressure tries to squeeze the drop, and the internal pressure inside the drop pushes back  - creating the internal pressure of the drop. This puts tension on the wall of the drop (Where the wall of the drop is caused by surface tension.). The geometric shape of the sphere minimizes the wall tension (http://hyperphysics.phy-astr.gsu.edu/Hbase/surten2.html).  A shape with corners, such as a cube, would allow forces to be concentrated at the corner, which would smash the corner flat, or else cause the area around the corner to expand. A sphere allows for an even pressure distribution.\n\nThe pressure on a planet is caused by its own weight pulling its own matter inward.  A sphere allows for an even distribution of gravational 'pressure'.  \n\nIn other words, a sphere resists being crushed better than any other shape, so objects under internal or external pressure tend to become round (irregardless of what is causing the pressure).
4899
You are already stressing the components of the motor by almost doubling the cubic centimeters and in my opinion adding the extra horsepower of nitrous to a motor that wasn't ment for it would cause blown head gaskets, overheating and piston melt down. Those motors are touchy enough without the nitrous!