Two glass bulbs and piston pump: what they have in common

1. Step 1. Two glass bulbs — is part of — Hourglass. Glass vessels.
2. Step 2. Hourglass — uses — Gravity flow. Sand pours through under gravity.
3. Step 3. Gravity flow — is used in — IV drip. The solution flows under gravity.
4. Step 4. IV drip — has part — Syringe. A needle.
5. Step 5. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.

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