What is happening when you put an effervescent tablet in a water weightless bubble? This is the experience tested by the astronaut Terry Virts currently on mission in the International Space Station (ISS). The scene was filmed in 4K by Epic Dragon RED camera. In the video, Terry Virts created a small bubble of water in which it inserts an effervescent tablet. The tablet will dissolve and create a lot of small air bubbles inside the water bubble. Question useless, Answer Useless !