Property

Nitrogen gas A

Nitrogen gas B

Argon gas

D10 (μm)

11.8

10.1

10.8

D50 (μm)

23.4

21.3

19.5

D90 (μm)

38.0

32.1

31.9

Convexity at D50

0.992

0.992

0.993

Aspect ratio at D50

0.978

0.978

0.983

Circularity at D50

0.911

0.914

0.940

Mean ρapp (g/cm3)

4.38

4.35

4.53

Mean ρtap (g/cm3)

5.00

5.07

5.19

Mean Hausner Ratio

1.14

1.16

1.15

Mean Hall flow rate (s/50g)

13.3

14.3

13.1

Mean angle of repose (˚)

31.6

32.6

30.9

Mean avalanche angle (˚)

40.9

41.0

36.7

Mean specific energy (mJ/g)

2.82

2.97

3.00

Mean volume porosity (%)

4.8

3.0

5.4

Permeability, at applied normal stress = 8 kPa (109 cm2)

9.0

6.5

5.8