When particles of matter are in direct contact and movement occurs in the substance due to convection, thermal energy transfers in which state of matter?

Amount of liquid measured in l or lm

How many grams are in 68.2 molecules of br2?

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?