When scientist record gas’s volume, they also record its temperature and pressure, why?

Good question. Im not sure what you mean by volumn in this case, but volumn, temperature, and pressure are just three different manifestations of the same thing: how fast gas molecules are flying. When they fly at high speed, our physical body senses it as heat(temperature) and pressure. Pressure is how hard you push something, and if there's high pressure it will push further, hence high volumn. Point being they are all basically the same thing with different names. Hope it helps...