Freeze-drying and bellows: what they have in common

1. Step 1. Freeze-drying — uses — Vacuum. Ice sublimating in a vacuum.
2. Step 2. Vacuum — is used in — Vacuum pump. The pump creates a vacuum.
3. Step 3. Vacuum pump — has part — Check valve. Valves stop air from flowing back.
4. Step 4. Check valve — is part of — Bellows. An air intake valve.

Open Evothings