As per charles law, if pressure is kept constant, temperature is
directly proportional to volume.
T1/T2 =V1/V2
T2 = T1v2 /
V1Â Â where temperature in kelvin and volume in
litres.
1)when V2 = 1.5L,   T2=
273.15 *1.5 / 4
                                      Â
=409.725 /4
                                       Â
=102.43 KÂ Â Â Â Â Â =
-170.710C
(0.0k = -273.150CÂ Â Â , 00C
= 273.15K)
temperature in celsius = temperature in kelvin - 273.15
Tc =102.43 - 273.15 = -170.710C
2) when v=1200ml = 1.2 litres
T2 =273.15 *1.2 /4 =327.78/4
        Â
=81.945K
Tc = 81.945 -273.15 = -191.2050C
