Key Terms
When objects absorb heat, they generally increase in size. This increase in size is called ________________.
Expansion/Thermal Expansion
As substances expand, what happens to their volume?
Increase
In order to measure temperature accurately, we use a ___________.
thermometer
When objects are cooled, they lose heat and generally decrease in size. This decrease in size is called ___________.
Contraction
As substances expand, what happens to their density?
Decrease
The amount of matter an object contains is its _________.
Mass
As substances contract, what happens to their density?
Increase
The common unit of temperature is _________.
Celsius
Concrete surfaces such as roads and paths expand when heated. ___________ found every few metres allows for expansion.
Small gaps
How do you remove the dent from a ping pong ball?
Place it in boiling water
What is the formula for density?
Density = mass/volume
As substances contract, what happens to their volume?
In cold weather, overhead wires contract and tighten. If they become too tight, the wires can break. What is being done to avoid this?
Wires are not stretched too tightly when installed.
To prevent cracking or breaking due to expansion, glasswares used for heating at home and in the
laboratory is made of ______________________.
Heat-resistant glass
As substances expand, what happens to their mass?
Modern bridges are made up of concrete or steel, making the bridge surface longer on hot days and shorter on cool days. What allows for this movement?
Expansion gaps or rollers