▁differential ▁sc anning ▁cal or imet ry ▁( D SC ) ▁instruments , ▁because ▁of ▁a ▁convenient ▁cry stal - c ry stal ▁transition ▁at ▁− 8 7 . 1   ° C . ▁ ▁Cy clo hex ane ▁v ap our ▁is ▁used ▁in ▁vac u um ▁car bur izing ▁furn aces , ▁in ▁heat ▁tre ating ▁equipment ▁manufact ure . ▁ ▁Con formation ▁ ▁The ▁ 6 - ver tex ▁edge ▁ring ▁does ▁not ▁conform ▁to ▁the ▁shape ▁of ▁a ▁perfect ▁hex agon . ▁The ▁con formation ▁of ▁a ▁flat ▁ 2 D ▁plan ar ▁hex agon ▁has ▁considerable ▁angle ▁stra in ▁because ▁its ▁b onds ▁are ▁not ▁ 1 0 9 . 5 ▁degrees ; ▁the ▁t ors ional ▁stra in ▁would ▁also ▁be ▁considerable ▁because ▁all ▁of ▁the ▁b onds ▁would ▁be ▁e cli ps ed ▁b onds . ▁Therefore , ▁to ▁reduce ▁t ors ional ▁stra in , ▁cy clo hex ane ▁adopt s ▁a ▁three - dimensional ▁structure ▁known ▁as ▁the ▁chair ▁con formation , ▁which ▁rapidly ▁inter convert ▁at ▁room ▁temperature ▁via ▁a ▁process ▁known ▁as ▁a ▁chair ▁f lip . ▁During ▁the ▁chair ▁f lip , ▁there ▁are ▁three ▁other ▁intermediate ▁conform ations ▁that ▁are ▁encountered : ▁the ▁half - ch air , ▁which ▁is ▁the ▁most ▁un stable ▁con formation , ▁the ▁more ▁stable ▁boat ▁con formation , ▁and ▁the ▁tw ist - bo at , ▁which ▁is ▁more ▁stable ▁than ▁the ▁boat ▁but ▁still ▁much ▁less ▁stable ▁than ▁the ▁chair . ▁The ▁chair