Final answer:
Passengers can carry up to 2 kg or 2 liters of medical or cosmetic articles, with each container not exceeding 0.5 kg or 0.5 liters, abiding by hazardous materials regulations during air travel.
Step-by-step explanation:
When transporting medical or cosmetic articles such as hairspray, perfumes, nail polish remover, and similar products by passengers, there are specific travel restrictions to ensure safety. These items are categorized under hazardous materials regulations due to their flammability. Passengers are permitted to carry a maximum quantity of 2 kg or 2 liters per person on board an aircraft, with each container not exceeding 0.5 kg or 0.5 liters. This restriction is put in place to minimize the risk of fire and ensure the safety of all passengers on board.