What does one ft^3 of air weigh in lbs?

Question

What does one ft^3 of air weigh in lbs?

Answer 1

1ft³ = 28317 cm³



1 m³ = 1000000 cm³ 1301

28317 cm³ x

1m³ air = 1301 gr

1 ft³ of air= 36,840417 gr

1lb = 453,6 gr

x 36,840417 gr



1 ft³ of air= 0,081217851 lb

Answer 2

At sea level and at 20 °C, dry air has a density of approximately 1.3 kg/m3. This is about 0.081lbs/ft^3.

This is at atmospheric pressure

Answer 3

Actually the density of air is temperature based, here is a list of density at various temps (degrees C)

Temp  ----    Density

(deg C)  -- (lbs/ft^3)

-150====0.1744

-100====0.1236

-50=====0.0958

0======0.0807

20=====0.0752

40=====0.0704

60=====0.0666

80=====0.0624

100====0.0591

120====0.0561

140====0.0533

160==== 0.0509

180==== 0.0486

200==== 0.0466

250==== 0.0421

300==== 0.0385

350==== 0.0353

400==== 0.0327