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Challenge: Problem 1

Specific heat is the ratio (per unit mass) of heat input to temperature rise. When a gas is maintained at a constant pressure it shows a greater specific heat (cp ) than when it is maintained at constant volume (ce ). In both cases, the gas is enclosed by a wall which allows heat transfer. Find those items on the RESPONSE ARRAY which describe fully the situ ation in which the specific heat at constant pressure is measured. Included in this set of items will he those which explain why cp > cv .

1
U = 0		 2
conversion of work into internal energy by compression		 3
transition of energy from potential state to thermal state		 4
conversion of internal energy into work by expansion		 5
Q = 0
6
transfer of energy through adiabatic enclosure		 7
specific heat		 8
heat transfer		 9
W = 0		 10
enclosure permitting transfer of energy by heat and by work
11
change of phase of the kind: liquid vapour		 12
chemical energy		 13
U 0		 14
T 0		 15
H 0
16
thermal equilibrium		 17
uncertainty of change in U		 18
V = 0		 19
P = 0 		20
T = 0