Changes of State & Density

What is melting?

Solid → liquid.

What is freezing?

Liquid → solid.

What is boiling?

Liquid → gas (throughout liquid).

What is evaporation?

Liquid → gas (surface only).

What is condensation?

Gas → liquid.

What is sublimation?

Solid → gas.

What happens during melting?

Particles gain energy and break free.

What happens during freezing?

Particles lose energy and lock into place.

What happens during boiling?

Particles gain enough energy to escape.

What happens during condensation?

Particles lose energy and come closer.

What is conserved in changes of state?

Mass.

Why is mass conserved?

Number of particles stays the same.

What is density?

Mass per unit volume.

Write the density equation.

ρ = m / V

Unit of density?

kg/m³

What is density linked to?

How closely packed particles are.

Which state is most dense?

Solid.

How do you find volume of a regular object?

Length × width × height.

How do you find volume of irregular object?

Displacement method (eureka can).