Summarize the properties of materials, including melting point, boiling point, and conductivity, and provide examples.

Here is a summary of the information provided:

1. Using materials such as aluminium and magnesium alloys to carbon fiber can reduce the weight of a car by half, which helps save fuel.
2. The boiling point is the temperature at which a liquid turns into a gas when heat is added.
3. The melting point is the temperature at which a solid turns into a liquid as you decrease the surrounding temperature.
4. Different materials have different melting and boiling points.
5. The melting point of ice is $0^\circ\text{C}$ and the boiling point of water is $100^\circ\text{C}$.
6. If a cup has a melting point of $70^\circ\text{C}$, it can only contain warm liquids. It is not safe to use it for tea whose temperature could be above $70^\circ\text{C}$ because the cup would melt.
7. Electrical conductivity: Metals conduct electricity, while materials like wood cannot be used as a conductor.
8. Heat conductivity: Metals conduct heat.
9. Heat conductivity, also known as thermal conductivity, is the ability of a material to conduct heat.