This document is a science module from the Department of Education in the Philippines about the particle nature of matter. It contains 3 activities for students to explore properties of matter and how matter is composed of tiny particles. The activities involve observing samples of different materials, mixing salt and water, and adding food coloring to water. The module explains John Dalton's atomic theory and how atoms and molecules are the smallest fundamental units that make up matter. An analogy is provided that likens matter to pointillist paintings, with continuous images emerging from individual dots or particles.