Question: what is the difference between 40 and 70 alcohol?
Answer: 40% means that for every 100 mL, the product contains 40 mL alcohol. So, for a 70% label, every 100 mL of the product you buy has 70 mL alcohol. If the product is in 250 mL container, a 70% solution would have 175 mL alcohol present. Of course it is the 70% alcohol that is more potent in disinfecting your hands.