GAS THERMOMETERS QUESTION We have used the convenient approximation 1 kg/m^3 for
ID: 1770879 • Letter: G
Question
GAS THERMOMETERS QUESTIONWe have used the convenient approximation 1 kg/m^3 for the density of air under normal conditions. Describe how to determine this density more accurately, and use this method to find a better value.
GAS THERMOMETERS QUESTION
We have used the convenient approximation 1 kg/m^3 for the density of air under normal conditions. Describe how to determine this density more accurately, and use this method to find a better value.
GAS THERMOMETERS QUESTION
We have used the convenient approximation 1 kg/m^3 for the density of air under normal conditions. Describe how to determine this density more accurately, and use this method to find a better value.
Explanation / Answer
Use the Ideal Gas Law: PV = nRT
where: P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
Substitute density into the Ideal Gas Law equation: D (Density) = n/V = P/RT
where: D = density
P = pressure
R = gas constant = gas constant , J/(kg_degK) = 287.05 for dry air T = temperature
Substitute the applicable numerical values into the equation and solve for density.
For example, Use the ISA standard values for conditions at sea level. P = 101325 Pa
T = 15 deg C The air density is calculated to be: D = (101325) / (287.05 * (15 + 273.15)) = 1.2250 kg/m3
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