Which everyday item uses the principle of total internal reflection to transmit data as light signals?

Which device converts electrical energy into light energy using a glowing filament?

Which common kitchen substance is used as a natural antacid due to its alkaline properties?

Which colorless and odorless gas is particularly dangerous because it can cause poisoning without detection unless monitored?

Which everyday material is a good thermal insulator commonly used in winter clothing to retain body heat?

Which part of the human respiratory system is primarily responsible for warming and filtering incoming air?