The density of air can be estimated from the product of molar mass and molar density:
Write a function that finds the density of air in kg per cubic meter, for input temperature (in Kelvin) and pressure (in mb). This function should allow: a single input temperature and pressure pair, a single temperature and vector of pressures, a single pressure and and a vector of temperatures, a vector of pressures and a vector of temperatures of the same size (interpreted as pairs). Return -1 if a P and T are unequal vector dimensions greater than 1.
Note: convert values to 
.
.Note:
See Problem 56328. Molar Air Density from Temperature and Pressure for explanation of how to find the molar density of air can be found from the Temperature and Pressure using the ideal gas law.
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