A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
Removing a small amount of oxygen gas.
Removing a small amount of barium oxide.
Adding helium gas to the vessel.
Lowering the temperature.
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
1.0
3.0
7.0
13.0
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