Question

An electric iron is used to remove wrinkles from clothing. The electric iron is made of metal. Which property of this substance is most useful for this application?
a boiling point

b density

c electrical conductivity

d thermal conductivity

Answer 1

The correct option is D.

Metals have different properties which are utilized in diverse ways to meet the need of man. One of the properties of metals is thermal conductivity. Thermal conductivity refers to the ability of the metal to conduct heat. This property is especially useful in the working of electric pressing iron. The heat released by the metal that is used in the manufacturing of the iron is regulated by mean of thermostat, which keep the heat constant in order to protect the clothes been ironed from damage.

Answer 2

It would most likely be D. Thermal conductivity, as the metal used in ironing is able to conduct heat and allow ironing to be done.