The air meter used in this lab (Apparatus B in ASTM C231) operates on the princi
ID: 951265 • Letter: T
Question
The air meter used in this lab (Apparatus B in ASTM C231) operates on the principle of Boyle's law. The meter you will use in class has a calibrated gauge for this determination. But suppose that the initial pressure was 20 psi (2,880 pounds per square foot), the initial chamber volume was 0.02 cubic feet, the volume of the canister holding the PCC was 0.25 cubic feet, and the pressure after releasing the valve was 10 psi (1,440 pounds per square foot). What would the air content be as a percentage of the total PCC volume? You may assume that the temperature is constant in both cases.
A)12%
B)15%
C)8%
D)10%
Please help me as soon as possible thank you
The air meter used in this lab (Apparatus B in ASTM C231) operates on the principle of Boyle's law. The meter you will use in class has a calibrated gauge for this determination. But suppose that the initial pressure was 20 psi (2,880 pounds per square foot), the initial chamber volume was 0.02 cubic feet, the volume of the canister holding the PCC was 0.25 cubic feet, and the pressure after releasing the valve was 10 psi (1,440 pounds per square foot). What would the air content be as a percentage of the total PCC volume? You may assume that the temperature is constant in both cases. 12% 15% 18% 10%Explanation / Answer
Use Boyle’s law equation for solving,
P1V1=P2V2=constant(P=pressure,V=volume)
P1=20Psi
V1=0.02 cubic feet
P2=10Psi
V2=P1V1/P2=20 Psi*0.02 cubic ft/10Psi=0.04 cubic ft
PCC volume=0.25 cubic ft
% air of PCC volume=0.04/0.25*100=16%
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