This demonstration presents results from a GOTHIC calculation for steam being injected into cold water. The container is initially filled with air and water and is closed at the top. Steam is injected from the right side in the form of a horizontal jet with a velocity of 13 meters per second. The injected steam pushes the water toward the top of the container, compressing the air above. As individual steam bubbles break free of the jet and rise toward the top, steam condensation causes them to decrease in size.