是的,瓶装液态CO2,瓶内压力是随温度变化而变化的.
■但是
■在30.9782℃（CO2的临界温度）以上时
■CO2 *不可能* 是液态.
■这时无论如何加压,CO2都为气态.
参考：临界温度
http://baike.baidu.com/view/74498.htm
在30℃以下时,压力和温度的对应关系如下：
（CO2正常沸点-78.40 ℃）
Temperature (℃) → Pressure (MPa)
-56 → 0.53065
-55 → 0.55397
-54 → 0.57805
-53 → 0.60291
-52 → 0.62857
-51 → 0.65504
-50 → 0.68234
-49 → 0.71049
-48 → 0.73949
-47 → 0.76937
-46 → 0.80015
-45 → 0.83184
-44 → 0.86445
-43 → 0.89800
-42 → 0.93252
-41 → 0.96801
-40 → 1.00450
-39 → 1.04200
-38 → 1.08050
-37 → 1.12010
-36 → 1.16070
-35 → 1.20240
-34 → 1.24520
-33 → 1.28910
-32 → 1.33420
-31 → 1.38040
-30 → 1.42780
-29 → 1.47630
-28 → 1.52610
-27 → 1.57700
-26 → 1.62930
-25 → 1.68270
-24 → 1.73750
-23 → 1.79350
-22 → 1.85090
-21 → 1.90960
-20 → 1.96960
-19 → 2.03100
-18 → 2.09380
-17 → 2.15810
-16 → 2.22370
-15 → 2.29080
-14 → 2.35930
-13 → 2.42940
-12 → 2.50100
-11 → 2.57400
-10 → 2.64870
-9 → 2.72490
-8 → 2.80270
-7 → 2.88210
-6 → 2.96320
-5 → 3.04590
-4 → 3.13030
-3 → 3.21640
-2 → 3.30420
-1 → 3.39380
0 → 3.48510
1 → 3.57830
2 → 3.67330
3 → 3.77010
4 → 3.86880
5 → 3.96950
6 → 4.07200
7 → 4.17650
8 → 4.28310
9 → 4.39160
10 → 4.50220
11 → 4.61490
12 → 4.72970
13 → 4.84660
14 → 4.96580
15 → 5.08710
16 → 5.21080
17 → 5.33680
18 → 5.46510
19 → 5.59580
20 → 5.72910
21 → 5.86480
22 → 6.00310
23 → 6.14400
24 → 6.28770
25 → 6.43420
26 → 6.58370
27 → 6.73610
28 → 6.89180
29 → 7.05090
30 → 7.21370