This document discusses different measurement units and concepts including distance, mass, volume, density of liquids, and density of irregular solids. It explains that the meter is the basic unit for measuring distance, with millimeters, centimeters and kilometers as other common units. Mass is measured in grams using a balance and remains constant. Volume is measured in liters using a beaker or graduated cylinder. The density of a liquid is its mass per unit volume measured in grams per milliliter, with water having a density of 1 g/mL. An object's density determines if it floats or sinks in a liquid. Density of an irregular solid can be found using water displacement by measuring the volume of water before and after placing the object in.

1. Measurement

2. Distance Measures the space between two points Meter is the basic unit; mm, cm, and km are also common 1000mm = 1m 1m = .001km

3. Mass The amount of matter in a material Gram is the basic unit; mg and kg are also common Measured with a triple beam balance Remains constant – never changes

4. Volume The amount of space an object takes up Liter is the basic unit Measured with a beaker or graduated cylinder

5. Density of a Liquid The amount of matter in a given space Mass ÷ Volume (mass/volume) g/mL Water = 1g/mL If the density of the object is less than the density of the liquid, then it floats. If the density of the object is greater than the density of the liquid, then it sinks. Think of Italian Salad Dressing…

6. Density of an Irregular Solid Water Displacement Find the volume of the liquid. Drop the object into the liquid. Measure the new volume. Subtract – this is the volume of the irregular solid. Think Bathtub…