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
MRT expands in hot weather. ___________ in the tracks allow for this expansion.
Small gaps
Made up of two metals, commonly brass and steel.
Bimetallic Strip
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 SI unit of temperature.
Kelvin (K)
If the gaps in the MRT tracks are too small, what happens?
Bend/buckle
These are used in some electrical appliances to keep the appliances within a fixed range of temperature
Thermostat
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?
A temperature of 0 K is the lowest temperature possible anywhere. This is called the __________.
Absolute zero
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
How tall is the Eiffel Tower in the summer?
As substances expand, what happens to their mass?
Give two uses of expansion and contraction.
Bimetallic thermometer and thermostat
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
Pipes carrying hot water or steam have _____________ in them to allow for expansion, preventing the pipes from bending or buckling.
Expansion loops