Matter is anything that has mass and takes up space. The bookbag has a lot of matter because it is heavier. The pencil has less matter because it is lighter.
Mass is the amount of matter in an object. Mass is measured with a digital scale or triple beam balance. UNIT used to measure mass is grams
Weight depends on gravity. Weight is not the same as mass because the mass of any object in space or earth stays the same, but the weight would be different.
Volume is the amount of space an object takes up. Equipment to measure volume: beaker or graduated cylinder. You measure irregular objects using a technique called Water Displacement. UNIT used for measuring volume is mL.
Objects with many particles of matter in a space have high density because matter with small volume is tightly packed.
Objects with few particles of matter in a space have low density because matter with higher volume is less tightley packed.
DENSITY is the amount of matter an object is given.
Density of water is 1.5g/mL, This means that 45g of water has a volume of 30mL. Objects with a density lower than water, like an apple, will FLOAT in the water. Objetcs with a density higher than water, like a penny, will SINK in water.