# Day43 · Properties doing a job

## Complete source

Ordinary fictional pop-up workshop. Mina makes a foldable aluminium backdrop for a puppet scene; the labelled foil bends into a curve. A separate diagram shows a copper electrical wire in a reading lamp. F2 describes copper as a good electrical conductor and links this property to wiring. F1 describes aluminium foil as thin rolled aluminium. No child is asked to handle electricity or prove conductivity. Mina's curved backdrop stands only in the supplied drawing. Its strength, heat performance and suitability for outdoor weather have not been measured.

## Question

Why is a property useful for a particular job?