Three close words:
熔解 (róngjiě, melting of solids — physics/metallurgy),
溶解 (róngjiě, dissolving in liquid — chemistry),
融化 (rónghuà, melting/thawing — everyday, ice cream, snow). Different left radicals:
火 (fire),
氵 (water),
虫... wait —
火 and
氵 mark
熔 vs
溶.