: I'm not seeing any movies shown, nor am I seeing this proven in any form. And you're relying wholly on a Plot-Device used against Brolly as if it has any actual meaning. It doesn't. Any other day of the week and the Sun wouldn't even give him a tan. And the fact that in the continued story it doesn't kill him would say otherwise about the Sun offing him. Which, again, wasn't even the case.
The kamehameha wave doesn't have heat behind it.
Tell that to Freeza's hand which showed burn marks and literally had smoke rising from his palm after blocking Goku's 20xKaioken Kamehameha. Ki can be manipulated in other forms. Roshi and others have used it to form electric based attacks. Roshi creating an electric net he used on Goku during the 21st Budokai. If we include the Otherworld Tournament, Pikkon created both Fire and Lightning with his Ki for this "Thunderflash Attack".
Otherwise Roshi couldn't have put out a mountain of flames with it.
put out the fire on the Ox Kin's mountain. He intended
to blow away the fire. Instead he Blew Up the Mountain
. Also it is clear that Ki can do more than just create heat as concussive force alone isn't enough to break down cellular matter. Gohan's blast on Cell destroyed his every cell, including his nucleus, vaporizing him utterly.