Heat transfer
why would space be left at the top of her plastic bottle when filling with water and then freezing?
because water expands when frozen
Charles is boiling water to make macaroni n' cheese. The process of heating the pot is an example of
convection
which best describes heat transfer by radiation?
cooking a hotdog in a microwave
What enables firemen to enter buildings that are on fire and return from them safely?
firemen wear heat resistant suits
Popcorn is made from corn kernels. What occurs when kernels are heated in a microwave?
the kernels expand
which best explains why there are gaps between the concrete sidewalks?
when it is hot the gaps allow expanding without cracking
A spoon is placed into a mug of hot coffee. As the spoon sits in the coffee it begins to get warm. The heat from the coffee moves to the cool spoon. The spoon is an example of a(n)
Conductor
Many electrical wires are wrapped with a plastic coating because plastic is
A good insulator
when choosing materials to build a fireplace, why is brick a better choice than metal?
Brick is heat resistant
what is the original source of most of the energy that people use?
By radiation from the Sun
You are on a camping trip and You forgot your cooking supplies at home. What would be the best way to cook your food?
Food on top of a metal shovel over an open flame
Why does a balloon on top of a water bottle expand when the bottle is placed in hot water?
Heat causes gases to expand
Which best explains how this roasting marshmallows happens?
Heat from the fire is radiated into the marshmallow
Ms. Smith uses her lunch box to keep her lunch warm. The lunchbox is an example of a(n)
Insulator
If you cannot open a jar, why will placing the metal lid under hot water help to loose the lid?
Metals expand when they are heated
The power goes out at your house . After 2 hours you go to your freezer and you notice that everything is still completely frozen. Why did none of the food melt?
The freezer is made of material that insulates and keeps the freezer cold