Question: what are 3 physical properties of hydrogen?
Answer: Color : Colorless.
Phase : Gas : Hydrogen changes from a gas to a liquid at a temperature of -252.77°C (-422.99°F) : It changes from a liquid to a solid at a temperature of -259.2°C (-434.6°F)
Odor : Hydrogen is an odorless gas.
Taste : A tasteless gas.