Isotherms determined by the National Bureau of Standards acoustical thermometer in the liquid helium temperature range

Abstract

Is ulh e rm s u f Ih e s pee d uf s uuncl in he lium 4 g:as as a fun c l iun uf press ure have bee n meas ure d.Fi ve (If Ih e isu lh e rm s in Ih e liquid he lium 4 1e mpe ra lure ra n ge Ilave bee n a na lyze d , a nd Ihe res ull s a re di scussed .The acoustically d e t e rmine d valu es of te mpe rature are co ns is te ntly hig he r than Ih e va lu es of le mpe ralul'e a ss (lc ia led wilh Ih e liquid he lium 4 vapo r p ress u re sc a le (T ,.).T he d ev iali uns arc 0.006 O K a l 2 .323OK. 0.007 O K a l 2. 807 OK. 0.008 OK a l 3 .211O K, 0.0]0 OK a l 4.212 OK a nd 0.01 2 OK a l 5. 024 oK.Key Wurd s : Ac uu s li ca l Ih c nnuill e lc r, iso l he rlll a l low Ic mp e ra lllrc .S pee d of s uund in he lium ~as .th e rmom e try at lu w te mpe ratur e.

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