Chapter 2 Measurement

Chapter 2 Key Science Words Density Derived Unit Graph Kelvin Kilogram Liter Mass Meter Second SI Stadard Time Volume

Chapter 2 Measurement Density – Mass per unit Volume of a material describes how tightly packed a substance’s molecules are. Mathematically, density is defined as mass divided by volume. Units of density are usually grams per cubic centimeters (g/cm3) or grams per milliliter (g/mL)

Chapter 2 Measurement Kelvin - The kelvin is a unit of measurement for temperature. (K) The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

Chapter 2 Measurement Kilogram – The SI unit of mass. (kg) 1 kilogram is equal to 1000 grams. The gram was originally defined in 1795 as the mass of one cubic centimeter of water at 4 °C, making the kilogram equal to the mass of one liter of water.

Chapter 2 Measurement Liter – The SI unit of volume.

Chapter 2 Measurement Liter: The litre (International spelling as used by the International Bureau of Weights and Measures) or liter (American spelling) (SI symbols L)is a unit of volume equal to 1 cubic decimeter (dm3), 1,000 cubic centimeters (cm3) or 1/1,000 cubic meter. A cubic decimeter (or liter) occupies a volume of 10×10×10 centimeters (see figure) and is thus equal to one-thousandth of a cubic meter.

Chapter 2 Measurement Meter – SI unit of distance or length. Originally intended to be one ten-millionth of the distance from the Earth's equator to the North Pole (at sea level), its definition has been periodically refined to reflect growing knowledge of metrology. Since 1983, it has been defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second.

Chapter 2 Measurement Time comes in mixed units. Seconds are very short. Hours and minutes are more convenient for everyday time measurement.

Chapter 2 Measurement Electronic timers have displays that show mixed units. To read a timer you need to recognize and separate out the different units. Colons (:) separate the units.

Chapter 2 Measurement Standards were invented so people could communicate amounts to each other.

Chapter 2 Measurement Volume – is the quantity of three-dimensional space enclosed by some boundary. For example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. The volume of a container is generally understood to be the capacity of the container, (i.e.) the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces.