a heating unit that stores and warms water

when something becomes different over time

to move from one object to another or one place to another

the ability to make things move or change

the total kinetic energy of all the molecules that make up a sample

water that is underground

a measure of how hot or cold something is

the energy that an object has because it is moving

a set of interacting parts forming a complex whole

a group of atoms joined together in a particular way

when something stays mostly the same over time

a small part that is meant to show what the whole is like

tiny organisms that are made of a single cell

the moment when two objects hit each other

a balanced state in which a system is stable, such as when two or more samples are at the same temperature

to reach a conclusion using evidence and reasoning

anything that has mass and takes up space