noun
diffusion pump
A vacuum pump that uses a high-speed jet of vapor to entrain gas molecules. Used in scientific and industrial contexts.
この真空装置には拡散ポンプが使われている。
A diffusion pump is used in this vacuum apparatus.
Compound of 拡散 (kakusan, 'diffusion') and ポンプ (ponpu, 'pump'), a calque of English 'diffusion pump'.