which of the following substances are poor conductors of thermal energy ( more than one answer)

a: wood
b: glass
c: copper
d: plastic
e: iron
f: fiberglass
g: air

To determine which substances are poor conductors of thermal energy, we need to understand the concept of thermal conductivity. The thermal conductivity of a material refers to its ability to conduct heat. Materials with low thermal conductivity are considered poor conductors of thermal energy.

Here's how we can analyze each substance to determine its thermal conductivity:

a: wood - Wood is a poor conductor of thermal energy because it contains air pockets, which hinder the flow of heat.

b: glass - Glass is a poor conductor of thermal energy due to its low thermal conductivity.

c: copper - Copper is an excellent conductor of thermal energy. It is not a poor conductor.

d: plastic - Many types of plastic are poor conductors of thermal energy. However, it's important to note that not all plastics have the same thermal conductivity. Some plastics have higher thermal conductivity, while others have lower.

e: iron - Iron is a good conductor of thermal energy. It is not a poor conductor.

f: fiberglass - Fiberglass is a poor conductor of thermal energy due to its low thermal conductivity.

g: air - Air is an excellent insulator and a poor conductor of thermal energy.

Based on the analysis above, the substances that are poor conductors of thermal energy are:
- Wood
- Glass
- Plastic
- Fiberglass
- Air