Gaseous condensates: orders of magnitude Dilute gaz at temperature T' confined in harmonic trap :∷∷ V(7)=-mr Condensation threshold 「no: central density N=1.202/2)3 kg7>加3=2612 h 2zmk t Liquid helium Gaseous condensates 1027 atoms/m 1019 atoms/m n013=10AT~1K 1/3=05mT~1uK1 2 2 ( ) 2 V r = mω r G Gaseous GaseousCondensates Condensates: orders : ordersofofmagnitude magnitude Dilute gaz at temperature T confined in harmonic trap : Condensation threshold: n0 : central density 3 1.202 Bk T N ω   =     = 3 0n λ = 2.612 Bk T  =ω 2 B h mk T λ π = Liquid Helium : 1027 atoms/m3 n0-1/3 = 10 Å T ~1 K Gaseous condensates: 1019 atoms/m3 n0-1/3 = 0.5 µm T ~1 µK