a man experimenting with liquids
a man explains how to do a experiment
a man is doing an experiment
a man is doing an experiment
a man is doing some experiment with chemicals
a man is performing an experiment with liquid and explaining the steps
a man is pouring liquid into chemistry containers
a man is pouring purple liquid into the glass vessel
a man is pouring solution into a test tubes
a man pours a liquid into two glass tubes
a person is preparing a science project
a person pours some liquid into a beaker
a science experiment is shown
liquid is being pored into beakers
man is doing a experiment
person performing experiment and pouring lquid into containers
science experiment transferring liquids into containers
someone is filling a beeker
someone is providing steps to liquid experiment
a man is doing an experiment