Cone-shaped paper filter and voltaic pile: what they have in common

1. Step 1. Cone-shaped paper filter — is part of — Paper coffee filter. Pleats shaped like a funnel.
2. Step 2. Paper coffee filter — works like — Water filter. Filtering a liquid through a porous medium.
3. Step 3. Water filter — uses — Gravity flow. Water seeps through by gravity.
4. Step 4. Gravity flow — is used in — Gutter. Drainage.
5. Step 5. Gutter — is made of — Zinc. Galvanized steel.
6. Step 6. Zinc — is material for — Voltaic pile. The pile is discs of zinc.

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