## Glossary of physical science chp. 3

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- meniscus
- curve seen at a liquid's surface, especially in a graduated cylinder

- spring scale
- an instrument for measuring weight

- metric system
- a decimal system of measurements based on the meter; SI

- second
- the basic unit of time;

9,192,631,770 vibrations of a cesium atom

- newtons (N)
- the metric unit of weight

- balance
- an instrument for measuring mass

- volume
- any space defined by length, width, and height

volume=length x width x height

v=lwh

- mass
- the quantity of matter in an object

- meter (m)
- the basic unit of length of the metric system; 39.37 inches

- liter (L)
- the volume of a cubic decimeter

- significant digits (figures)
- all of the certain digits plus one doubtful digit in

a measurement

- density
- the mass in a unit of volume

density=mass/volume

d=m/v

- law of mass conservation
- in all chemical and physical changes, matter is neither created nor destroyed

- weight
- the measure of the force of gravity on an object

- water displacement method
- measuring the volume of an irregularly shaped object by submerging it in water contained in a graduated cylinder and taking before and after measurements

- unit analysis
- a mathmematical tool to convert between units

- units
- descriptive notes that accompany numbers

- SI or Systeme International

(French for International System) - the systematized units of the metric system; time (second), temperature (Kelvin), electrical current (ampere)which simplifies and standardizes all scientific work

- kilogram (kg)
- the mass of a liter of water; 1000 grams

- scientific notation
- using the power of 10 to express very large or very small numbers