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Many foods darken after cooking. The higher pressure and temperature of pressure cooking can darken them.
Read the side of your tire. It will tell you on there.
3000 pounds of pressure they can snap a broom handle in half
You need six pounds of pressure to torque.
60-66PSI I think.
556 pounds
35-4500 pounds
Up to 180 pounds
About 14,000 pounds per square inch
Most mechanical fuel pressure, if equipped with electric pump, should resd 35-45psi
My wife and I have been canning for over 20 years and we re-use our lids each year. Occasionally a jar will not seal (about 1 or 2 per year), but we have never gotten sick from our home canning. However, one must be prudent when opening a jar so as not to bend the lid unduly.