This sealing ring is black with a yellow spot and made from nitrile rubber and is the sealing ring to be used where there are petrol or oil residues on the waste water (e.g. in connection with oil and petrol separators at service stations, garages etc.).
The polar circumference (logitudinal circumference) of the Earth is about 40,008 kilometers (24,860 miles). The equatorial circumference of the Earth is about 40,075 kilometerâ¦s (24,901 miles). More Precisely: Earth is not a perfect sphere, but is an oblate spheroid, .336% flattened along the North-South axis.
Although they knew it was a sphere, they didn't know how big the sphere was. The philosopher Plato (400. ) declared the earth's circumference to be 64,412 kilometers (40,000 miles). Some 150 years later, the mathematician Archimedes estimated it to be 48,309 kilometers (30,000 miles).