Video: Dab tsi yog qhov ceev ntawm helium?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Chemical zog ntawm helium - Kev noj qab haus huv los ntawm helium
| Atomic naj npawb | 2 |
|---|---|
| Atomic loj | 4.00260 g -1 |
| Electronegativity raws li Pauling | tsis paub |
| Qhov ntom | 0.178*10 -3 g.cm ua -3 ntawm 20 ° C |
| Melting point | -272.2 (26 atm) ° C |
Yog li ntawd, dab tsi yog qhov ceev ntawm helium gas?
| Helium | |
|---|---|
| Phase ntawm STP | gas |
| Melting point | 0.95 K ?(−272.20 °C, ?−457.96 °F) (ntawm 2.5 MPa) |
| Boiling point | 4.222 K ?(−268.928 °C, ?−452.070 °F) |
| Qhov ceev (ntawm STP) | 0.1786 g / L |
Ib sab saum toj no, dab tsi yog qhov ceev ntawm helium ntawm STP? 0.179 g / L
Raws li, qhov ceev ntawm helium hauv Kg m3 yog dab tsi?
Kev sib tham
| khoom | Qhov ceev (kg / m3) | Qhov ceev (kg / m3) |
|---|---|---|
| helium, roj, ~ 300 K | 0.164 | 999.84 |
| helium, kua, 4k | 147 | 916 |
| hydrogen (H2), 300 K | 0.082 | 922 |
| hydrogen (H2), dej, 17 K | 71 | 927 |
Peb puas tuaj yeem ua helium?
Tsis muaj tshuaj lom neeg txoj kev tsim khoom helium , thiab cov khoom siv peb muaj keeb kwm nyob rau hauv qeeb heev radioactive alpha lwj uas tshwm sim nyob rau hauv pob zeb. Nws raug nqi ib ncig ntawm 10,000 npaug ntxiv rau rho tawm helium los ntawm huab cua dua li nws ua los ntawm pob zeb thiab natural gas reserves. Helium yog lub thib ob-lightest element nyob rau hauv lub ntiaj teb no.
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