Making measurements

• A micrometer screw gauge is used to measure very small distances like the thickness of a wire.
• Density is how concentrated a materials mass is.
• Gases have much lower densities than liquids or solids.
• Density is the key to floating.
• Ice is less dense than water, which is why icebergs float rather than sink to the bottom of the ocean.
• Gold is denser than silver.
• Analogue clock: a clock that is traditional.
• Digital clock: gives a direct reading of the time in numerals.
• One swing of a pendulum is called a period.
• Density = Mass/Volume