In the video, a man is seen writing on a blackboard with chalk. He is wearing a black hat and glasses. The blackboard has various words and diagrams written on it, including "liquid", "gas", "clarinessie", "wood", "brain", "H2O", and "H2O2". The man is writing the word "H2O2" and then underlines it. The video is shot from a close-up angle, focusing on the man's hand and the blackboard.