Aluminium foil layer and davy lamp: what they have in common

1. Step 1. Aluminium foil layer — is part of — Tetra Pak. A barrier against light and oxygen.
2. Step 2. Tetra Pak — is made of — Paper. Cardboard.
3. Step 3. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
4. Step 4. Hot air balloon — uses — Convection. Hot air rises and fills the canopy.
5. Step 5. Convection — is a kind of — Heat transfer. A kind of heat transfer.
6. Step 6. Heat transfer — is used in — Davy lamp. The gauze draws off heat and stops the flame.

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