Blood pressure monitor e LIGO: o que têm em comum

1. Passo 1. Blood pressure monitor — evoluiu de — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
2. Passo 2. Manometer — funciona como — Barômetro. Both measure pressure with a column of liquid: a barometer measures the air around us, a manometer the pressure inside a vessel.
3. Passo 3. Barômetro — utiliza — Vacuum. The Torricellian vacuum above the mercury.
4. Passo 4. Vacuum — é utilizado em — LIGO. 4 km vacuum tubes.

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