Metric System ( SI Units) SI- __International System________________________ Mass – Mass is a measure of the amount of __matter__ in an object. (Weight is a measurement of how hard gravity is pulling on that object) Standard Unit of mass is the _____Grams___ Mass is measured using a balance (scale). We will measure mass using _Kilogram__ ( kg_ ), or milligrams ( mg_ ). Length – Length is a measurement of distance or dimension Standard Unit of length is the ___meter_____ We will measure using a ruler or a meter stick with the units ____millimeters_______ (mm), centimeters (cm), or meters (_m_). Volume – How much __space_____ an object takes up. Standard Unit of volume is the ___liter______ We measure volume in different ways. It depends on whether the object is a liquid or a solid. Liquid - Use a ____graduated______ cylinder. This is measured in _liters__ ( _L_) or milliliters (__ml__). The curvature of liquid is called the _______Meniscus___________. Solid- Use a ruler to measure the 3 dimensions of the object; ______length______, ___width___ & ________height_____. l x w x h = volume The volume of irregularly shaped solids can be measured by water displacement. Temperature is measured in degrees Celcius