Heat Transfer

Front

What is the original source of most of the energy that people use?

Back

By radiation from the Sun.

Front

Which best explains how roasting marshmallows happens?

Back

Heat from the fire is radiated into the marshmallow.

Front

Which best describes heat transfer by radiation? Options: A slice of bacon frying in a pan., A pot on a stove boiling water., Cooking a hotdog in a microwave., A hot air balloon.

Back

Cooking a hotdog in a microwave.

Front

Why is brick a better choice than metal for building a fireplace?

Back

Brick is heat resistant.

Front

What enables firemen to enter buildings that are on fire and return from them safely?

Back

Firemen wear heat resistant suits

Front

Why should space be left at the top of a plastic bottle when filling with water and then freezing?

Back

Because water expands when frozen.

Front

Why are there gaps between concrete sidewalks?

Back

When it's hot the gaps allow expanding without cracking.

Front

What occurs when popcorn kernels are heated in the microwave?

Back

The kernels expand.

Front

Why does a balloon on top of a water bottle expand when the bottle is placed in hot water?

Back

Heat causes gases to expand.

Front

Why will placing a metal lid under hot water help to loosen it?

Back

Metals expand when they are heated.