燒起來把東西推出去的材料
這一組的推力是燒出來的：材料在極短時間內變成大量氣體。
noun · C1
A substance that burns very fast and pushes something forward: the charge that sends a bullet out of a gun, or the fuel and oxygen that a rocket carries and burns to push itself up.
推進劑；發射藥
核心畫面
A way to hold this word: something is going to move, and this is the stuff that does the pushing. It is never the thing you care about — not the rocket, not the paint — only what drives it. In both uses a gas rushes out one way and the thing you wanted goes the other way; the difference is only whether the gas is made by burning or was pumped in and shut up under pressure.
可以想成：有東西要被推出去，而這個字指的是「負責推的那一份材料」。它從來不是你真正關心的那個東西，不是火箭，也不是油…更多收起
可以想成：有東西要被推出去，而這個字指的是「負責推的那一份材料」。它從來不是你真正關心的那個東西，不是火箭，也不是油漆，只是把它們送出去的那一份。兩個用法的畫面一樣：氣體往一邊衝，東西往另一邊走。差別只在那些氣體是燒出來的，還是原本就被壓在罐子裡。From the word’s history
From propel plus -ant, the ending that names the thing doing the action, so the word is simply 'the thing that propels'.
由 propel（推動）加上 -ant（做這個動作的東西）組成，字面就是「推東西的那一份材料」。
Wiktionary entry for propellant, supplied in this packet (kaikki:3f6f69a190036ae4:1008494628): 'From propel + -ant.'
Two branches
壓在罐子裡把液體推出去的氣體
推力一樣來自氣體，只是這些氣體不是燒出來的，而是事先被壓進罐子關起來。
noun · C1
The gas kept under pressure inside a spray can, which pushes the liquid out as a fine mist when you press the button.
噴霧罐裡的推進氣體
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
propellantnoun
- 1
anything that propels
- 2
anything that propels
- Then they backed the membrane with a gel matrix containing a perfluorocarbon (PFC) propellant and fluorescent "nanobullets" about a micron wide, and hit it with ultrasound.
- 3
anything that propels
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。