The sample

Hinge plate, g

Scale

Height of peak, mm

Width of peak, mm

Area of peak, mm²

Volume of gas, cm²

Surface area, m²/g

Raw Al₂O₃

0.071

64

134

1.8

15436.8

3.201

220.103

The sample 1

0.061

64

126

1.2

9676.8

2.02245

161.796

The sample 2

0.053

64

109

1.2

8371.2

1.74958

161.093

The sample 3

0.059

64

111

1.3

9235.2

1.93016

159.647