The kanji 溶溶 fundamentally conveys the concept of "melting," "dissolving," or "liquefying." It refers to the process of a solid changing into a liquid, or a substance breaking down and becoming incorporated into a liquid. The core idea is about transformation and the breaking down of a solid form.

・On-yomi (音読み): ヨウ ・Kun-yomi (訓読み): と（ける）, と（かす）

⚫︎氷が溶ける。 Translation: The ice melts. ⚫︎塩を水に溶かす。 Translation: Dissolve the salt in water. ⚫︎溶接（ようせつ） Translation: Welding (This is a compound word.)

The kanji 溶溶 is a phono-semantic compound (形声文字, けいせいいもじ). The semantic component is 氵（水, みず, meaning "water") which gives the kanji its meaning related to liquids and dissolving. The phonetic component is 容（ヨウ, meaning "appearance" or "to contain"). It suggests the sound of the character. This character originally meant "to flow" and "to melt." It has a sense of something changing its form and dissolving. The addition of the "water" radical further clarified the concept of a substance dissolving in liquid.