散開而變弱、消失
這個家族就是核心畫面本身，還沒有被借去講人或講錢。
noun · C1
The slow weakening of something such as heat, energy, sound, or a feeling, as it spreads out and gets thinner until almost none of it is left.
消散；散逸
核心畫面
You can think of a thin line of smoke leaving a candle. For a moment it is one clear shape in one place. Then it , thins, and mixes into the room until you cannot point at it any more. Nobody removed it. It disappeared by spreading. Every meaning of dissipation keeps that picture: something that was gathered in one place goes out in all directions and is gone.
可以想成蠟燭剛熄掉時的那縷煙。一開始它是集中的一條，看得很清楚。接著它往外變寬、變薄。最後就混進整個房間，你再也指不…更多收起
可以想成蠟燭剛熄掉時的那縷煙。一開始它是集中的一條，看得很清楚。接著它往外變寬、變薄。最後就混進整個房間，你再也指不出它在哪裡。沒有人把它拿走，它是散開才不見的。dissipation 的每個用法都留著這個畫面：本來聚在一起的東西往四面八方散開，然後就沒有了。From the word’s history
The word is dissipate plus the noun ending -ion, and dissipate goes back to Late Latin dissipātiō, from a verb meaning to throw or scatter in all directions. The scattering picture is already in the root.
這個字是 dissipate 加上名詞字尾 -ion，來源可追到晚期拉丁文 dissipātiō，原本的動詞就有「往四處丟散」的意思。也就是說，「散開」這個畫面在字根裡就在了。
Wiktionary entry for dissipation (packet evidence: 'From Middle English dissipacion, dissipacioun, from Late Latin dissipātiō. Morphologically dissipate + -ion.')
Two branches
把手上的東西散掉、把自己散掉
同一個畫面換一個主角：散掉的不再是熱或霧，而是某人本來握在手上的東西。錢、時間、力氣、健康都可以被當成一團會散開的東西。
noun · C1
The act of using up money, time, energy, or other things of value on nothing useful, until they are all gone.
揮霍；耗盡