[ 549 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • A chemistry student conducts an investigation on the behavior of gases. He knows that pressure, volume, and temperature are variables and keeps the amount of gas constant. In three experiments, he keeps one variable fixed, while he varies another and measures the third. The results are plotted on graphs. 60.0 40.0 20.0 0.0 0 200 400 600 Pressure (kPa) Volume (L) 60.0 40.0 20.0 0.0 0 200 400 600 Temperature (K) Volume (L) 200.0 100.0 0.0 0 200 400 600 Temperature (K) Pressure (kPa) Which conclusions about gas behavior are true? A. Temperature is inversely related to pressure and directly related to volume, while pressure is inversely related to volume. B. Pressure is inversely related to both volume and temperature, while volume is directly related to temperature. C. Volume is inversely related to pressure and directly related to temperature, while pressure is directly related to temperature. D. The amount of gas is directly related to pressure and temperature, but inversely related to volume.