PV=nRT is an example that deacribes the relationship between pressuee, volume, moles and temperature of a gas. This is an example of a

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.