1. True or False Questions 1. True or Talsei Air is a solid substance A. True or False Evaporation happens only at the surface of a liquid 1. True or False have the same thermal conductivity 4. True or False Electrical insulator allow electricity to flow easily 8. True or False: The metal base of an electric iron conducts both heat and electricity

Here are the answers to your true or false questions:1. **False**. Air is a mixture of gases, primarily nitrogen and oxygen. 2. **True**. Evaporation occurs when molecules at the surface of a liquid gain enough energy to escape into the gaseous state.3. **False**. Different materials have different thermal conductivities. For example, metals are generally good conductors of heat, while wood is a poor conductor.4. **False**. Electrical insulators resist the flow of electricity. Conductors allow electricity to flow easily.5. **True**. Metals are excellent conductors of both heat and electricity. This is why they are used in many applications, such as electric wires and cooking utensils.