Phosphor coating and dewar flask: what they have in common

1. Step 1. Phosphor coating — is part of — Fluorescent lamp. A coating that glows under UV.
2. Step 2. Fluorescent lamp — is made of — Mercury. Mercury.
3. Step 3. Mercury — is material for — Barometer. A column of mercury.
4. Step 4. Barometer — uses — Vacuum. The Torricellian vacuum above the mercury.
5. Step 5. Vacuum — is used in — Dewar flask. A vacuum.

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