Lesson 4 & 5 Science Test Flashcards
What is 1 thing that an object needs to have in order to expand or compress.
It needs to have gas inside.
What is pressure?
The force of molecules of a substance pushing on things when molecules hit.
What are some ways you can increase the pressure of a gas in a sealed container?
Add more gas (more molecules means more collisions) Reduce the volume (less space means more collisions)
What is 1 thing that an object needs to have in order to expand or compress.
The item needs to be made of a flexible material.
What is 1 thing that an object needs to have in order to expand or compress.
The gas must be sealed off.
What ways you can decrease the pressure of a gas in a sealed container?
Remove gas (less molecules means less collision)
Increase the volume (more space means less collision)
Melting Point is…
The temperature at which a pure substance will become liquid
Boiling Point is…
The temperature at which a pure substance will become gas.
Water is solid below: WHAT?
0 degrees celsius
Water is a liquid from
0 Degrees to 100
Water is a gas above…
100 Degrees Celsius
__________ can change in different locations on the planet for various reasons.
Air pressure
Typical air pressure is what?
14.7 psi
What is a vacuum?
A completely empty space that has no gas no molecules all.
What is compression?
Using the force to push something together to make it a smaller volume (“squishing”) but not changing the mass.
