~浴 (bathing in / immersed in)

The kanji 浴 ('bathing') as a noun-forming suffix, applied not just to water but to anything one immerses oneself in: 日光浴 ('sunbathing'), 海水浴 ('sea bathing'), 森林浴 ('forest bathing'). The framing treats light, air, or forest as a substance one bathes in.