Table 2. Experimental data for degassing of pressurized methane.

Run #	Pressure (psi)	Gas volume (mL)	13C (CH4) (PDB)
500-1	553	390	-43.5
500-2	537	420	-43.7
500-3	522	350	-43.6
1000-1	1019	420	-43.8
1000-2	991	1200	-44.3
1000-3	949	710	-44.1
1500-1	1548	1400	-43.6
1500-2	1502	1000	-43.6
1500-3	1459	1100	-44.6
2000-1	2014	950	-43.5
2000-2	1949	1070	-43.6
2000-3	1893	960	-43.9

Note: For the experiments conducted at 1500 and 2000 psi, all of the gas in the sampling tube could not be released at once, because the volume would have exceeded the capacity of the bubbling chamber. For these runs, the stated gas volume refers to the volume actually released to the bubbling chamber.