how to remove oxygen

Question 1

anaerobe gas-pak incubation jar

Answer 1

CO2 and H2 evolves from packet

H2 combines with O2 to form H2O - until NO more O2 remains

Question 2

candle jar

Answer 2

creates a microaerophilic environment with low levels of O2

active flame burns up most of the O2 trapped in the jar

remaining O2 is - 3% compared to atmospheric levels of -20%