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I think it's an index contour, but I'm not sure.
No. It changes negligably from the standard ~21% regardless of elevation. (at any elevation you can survive at anyway) :p The actual amount of available oxygen does change, due to a decrease in atmospheric density as elevation increases. For example: at 17,700ft (apparently a common Mt. Everest base camp) the air density is approximately 51% of the density at sea level. So you COULD express it as 51% of ~21%, which would be about 10.71%.
i need help with this soon as possible, show me example on how to use it.
The change in the elevation between isolines is called a contour line. Contour lines on a topographical map resemble a volcano.
metre
joules
cubic or cubed
liter and cubic centimeter
liter and cubic centimeter
volts
The most common units used to express the volume of gas are liters (L) and cubic meters (m³). Other units such as milliliters (mL) and cubic centimeters (cm³) are also used for smaller volumes.
nanometers
conduction, convention, and radiation
Kgxm2/s2
The SI unit for force is the Newton.
Energy - of any type - is measured in Joules.