看環境溫度和空氣流動速度，以及盛放液氮的容器。環境溫度越高，空氣流動越快，盛放容器熱傳導越快，蒸發就越快。
當然，也有可能是因為你對液氮罐及液氮不了解，只是感覺沒用多長時間。班德液氮罐建議你根據液氮罐的靜態液氮保存時間表測試一下，看看是否符合標準。以下是標準的靜態液氮保存期限表：
| 產品型號 | 靜態液氮保存期限（天） |
| YDS-2-30 | 30 |
| YDS-3-50 | 30 |
| YDS-6-50 | 63 |
| YDS-10-50 | 98 |
| YDS-10-80 | 62 |
| YDS-10-125 | 30 |
| YDS-10-210 | 7 |
| YDS-15-50 | 150 |
| YDS-15-125 | 50 |
| YDS-20-50 | 175 |
| YDS-30-50 | 260 |
| YDS-30-80 | 155 |
| YDS-30-210 | 65 |
| YDS-30-125 | 100 |
| YDS-35-50 | 290 |
| YDS-35-80 | 170 |
| YDS-35-125 | 110 |
| YDS-35-210 | 80 |
| YDS-30B-50 | 170 |
| YDS-35B-50 | 185 |
| YDS-50B-50 | 220 |
| YDS-50B-80 | 160 |
| YDS-50B-125 | 120 |
| YDS-50B-210 | 78 |
| YDS-60B-210 | 100 |
| YDS-80B-210 | 120 |
| YDS-100B-210 | 140 |
