Question

Which would be the worst heat insulator for filling opening the concrete wall opening - wood, fiberglass insulation or steel and why?

Answer 1

The worst heat insulator here will be steel.

As we know metals are good conductors of heat leaving exceptions and steel is made from iron so steel is a conductor of heat and also sttel has a very low R value as compared to wood and glass.

R value is thermal resistance per unit area.

Where as glass and wood are good heat insulators so these can be used in place of steel.

For example we see in our daily life that window and door frames which are exposed to sunlight specially are made of wood, glass and other insulating materials. In utensils also we see handles and covers are made of wood and glass and plastics etc.

So, finally Steel is worst insulating material among the three given here.

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