看(kan)環(huan)境(jing)溫度和(he)空(kong)氣流動速度，以及(ji)盛放液氮的容(rong)器。環(huan)境(jing)溫度越(yue)(yue)(yue)高，空(kong)氣流動越(yue)(yue)(yue)快(kuai)(kuai)，盛放容(rong)器熱(re)傳導越(yue)(yue)(yue)快(kuai)(kuai)，蒸(zheng)發就(jiu)越(yue)(yue)(yue)快(kuai)(kuai)。
當然，也有可能是因為你對液氮罐及液氮不(bu)了(le)解(jie)，只是(shi)(shi)感覺沒用多長時間(jian)。班德(de)液氮罐(guan)建議你(ni)根(gen)據液氮罐(guan)的(de)靜(jing)態液氮保(bao)(bao)存時間(jian)表(biao)測試一下，看(kan)看(kan)是(shi)(shi)否符合標準。以下是(shi)(shi)標準的(de)靜(jing)態液氮保(bao)(bao)存期限表(biao)：
| 產(chan)品型(xing)號 | 靜(jing)態液氮保(bao)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 |
