.045 thousandths of an inch thick, and another piece is .032 thousandths of an inch thick, how do I go about finding how much the first pipe is thicker in percent?
It depends entirely on the tyres. The tyres fitted to your car should structurally match the tyres fitted from new, and the pressure placard should still be accurate, because tyre shops are supposed to fit the tyres your car requires. If the tyres are the same diameter, width profile, load and speed rating as the originals, then it's safe to say the placard is pretty much spot on. Most tyres have a maximum recommended running pressure on the side wall anyhow. Most (but not all) passenger cars are happiest on about 34 psi. But once you get into higher performance cars with very low profile tyres, like 40, 30, or even 25 series tyres, recommended pressures can vary wildly. Some low profile tyres are made to run at 'normal' pressures, and some require much higher pressures - up to 60 psi.
It is, as long as 35psi is less than what is stamped ON THE TIRE as the max. Never, ever rely on post pressure ratings (those on the door post). Car companies often make those lower than they should be to give a smoother ride. My Toyata Tacoma calls for 26 PSI!! I keep 35 in all four tires. Bumpier, yes. Better mileage, also yes.
(I think you got your units wrong - you probably meant 45 thousandths of an inch and 32 thousandths of an inch, which is the same as 0.045 in and 0.032 in - 0.032 thousandths is 0.000032 inch, which is an awfully thin pipe!) The first step is easy - find the difference between the measurements. 0.045 in - 0.032 in 0.013 in To find the percentage difference, you need something to divide the difference by. Since we're talking about how much thicker the 1st pipe is than the 2nd pipe, we use the 2nd pipe as our baseline - in other words, a thickness equal to the 2nd pipe would be 100%. We can actually treat that as a unit conversion. If 0.032 inch 100%, then 100% / 0.032 inch 1. 0.013 in * 1 0.013 in * 100% / 0.032 in 0.013 in / 0.032 in * 100% 0.41 * 100% 41% So, the 1st pipe is 41% thicker than the 2nd pipe. Note: We could also talk about the thickness of the 1st pipe *in terms of* the thickness of the 2nd pipe, instead of how much *thicker* the 1st pipe is. In that case, we would skip finding the difference, and just use the 1st pipe's thickness. 0.045 in * 1 0.045 in * 100% / 0.032 in 0.045 in / 0.032 in * 100% 1.41 * 100% 141% So, the 1st pipe is 141% of the thickness of the 2nd pipe. Compare those statements: The 1st pipe is 41% *thicker than* the 2nd pipe. The 1st pipe is 141% *of the thickness of* the 2nd pipe. These two statements are closely related: the second one will always have a percentage that is equal to the percentage of the first plus 100%. This can sometimes be very confusing, especially when we aren't careful about our word choice! I hope that helps you out!
complicated subject. try searching with yahoo and bing. that could actually help!
First, you should realize that .045 thousandths is a VERY small thickness for something called pipe. I'm pretty sure you meant to say 45 thousandths of an inch, or .045 inch. Then it's a simple matter of dividing .045 by .032, which is 1.40625. That means the first pipe is 40.625% thicker than the second.
