Consider a system consisting of an ideal gas confined within a container、one wall of wh the gas in the form of heat by immersing the container in ice water. energy can be added aside, the internal energy of the gas is reduced by the amount of work done the internal energy of an ideal gas is directly proportional to its absolute temperature t learning goal: diagram and the quantities q, w, and δu so the absolute temperature t is directly proportional to the prodact of the absolute pres is an expressice of con of energy. this law states that changes in the first law of the internal energy of a system au can be explained in terms of energy transfer into or out of the system in the form of heat q and or work w. is this problem, we will write the first law of thermodynamics as a pv diagram figure 1) is a convenient way to track the pressure and volume of a syste diagram) to another. work corresponds geometrically to the area under the curve on a pl the system, thereby reducing its internal esergy you will determine the mzes ofthese energy transfers and classify their effect otthe system as energy訓or energ) our what is the sign of alu as the system of ideal gas goes from point a to point b on th o the internal energy of the system increases, so au is posstive 。the internal energy of the system decreases, so ais negative