How many times more dense is the densest substance than the least dense substance?
2.72
5
8.4
13.6

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

: )

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;