Water at its freezing point (ti, pi) completely fills a strong steel container. the temperature is reduced to tr at constant volume, with the pressure rising to pf (a) show that the fraction y of water that freezes is given by v-v (b) state explicitly the simplifying assumptions that must be made in order that y may be written v" [2"(t,- t) - "(p,- p) i= 0°c, 1.01 x 105 pa; f= -5°c b"67 x 10-6 k-1; k" = 12.04 x 10-1" pa-; v- vf= -1.02 x 10-4 m3/kg. 5.98 x 107 pa