A physical property can be measured or observed without changing the composition or identity of the sustance. They are characteristics which are detected by our senses or instruments which are extensions of our senses. They change words into numbers. A Chemical property is a characteristic of a material involving a chemical change. A physical change is a change in the form of matter but not its chemical identity.
Water is still water whether in the solid, liquid or gaseous form.
Words which describe physical changes are melting, freezing, evaporating, boiling, condensing, subliming. Qualitative and Quantitative Observations are made. Our ability to measure depends on current technology. SI Unit Convention-Scientists must measure using the same units so they can compare data conveniently. Based on powers of 10.