Answer:
The particle theory is the belief that everything in our solar system and beyond is made of very small matter called atoms. The 10 mL is a matter in our solar system and even though we cannot see, there are millions- if not billions of smaller particles that make up the liquid. If you view the picture below, you can see that the particles in a liquid are close to one another, particles in a gas are far apart, and a particle in a solid is tightly pushed together. This gives them their distinctive shape. Since this is a liquid, this means that the particles are close together, but not very close. The particles glide over one another. If you want to have more space between the particles and expand the size of the liquid you can boil the water, however boiling the water turns it into gas and causing the liquid to evaporate. Freezing the liquid would cause the particles to be closer packed together, making a solid. The amount of liquid you have can not change. There is still 10 mL even when the liquid is frozen or when the liquid boils into vapor in the air. Therefore using particle theory, we can know that a shape can only expand or shrink when changing states of matter.
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