vet-tech-chem-ch-1-measurements

• measured in degrees C
• a temperature scale on which water has a freezing point of 0 deg C and a boiling point of 100 deg C.

• a unit of length in the metric system
• there are 2.54 cm in 1 in

a substance that has the same composition and properties wherever it is found

the science that studies the composition, structure, properties and reactions of matter

• a ratio in which the numerator and denominator are quantities from an equality or given relationship
• for example, the conversion factors for the relationship 1kg = 2.20 lbs are written as:
• - 2.20 lb 1 kg
• ------- and ---------
• 1 kg 2.20 lb

• the volume of a cube that has 1-cm sides
• 1 cc = 1 ml

• the relationship of the mass of an object to its volume expressed as grams per cubic centimeter (g/cm3), grams per milliliter (g/ml) or grams per liter (g/L)
• Density = Mass / Volume or D = M/V

a relationship between two units that measure the same quantity

a number obtained by counting or by definition

• a substance floats in water if its density < that of water
• a substance will sink in water if its density > that of water

the metric unit used in measurement of mass

an international system of units that modifies the metric system

• measure in K (no degrees)
• a temperature scale on which the lowest possible temperature is 0 K

• a metric mass of 1000 g
• equal to 2.20 lb
• SI standard unit of mass

the distance from one point to another

the metric unit for volume that is slightly larger than a quart

• a measure of the quantity of material in an object
• the amount of matter in an object

• a number obtained when a quantity is determined by using a measuring device
• numbers that you have read from an instrument
• always includes one estimated value

• the metric unit for length that is slightly longer than a yard
• SI standard unit of length

a system of measurement used by scientists and in most countries in the world

• a metric unit of volume equal to one-thousandth of a liter
• 1 mL = 0.001 L

• the part of the name of a metric unit that precedes the base unit and specifies the size of the measurement
• all prefixes are related on a decimal scale:
• - Kilo (k) = 1000 or 10**3
• - Centi (c) = 1/100 or 0.01 or 10**-2
• - milli (m) = 1/1000 or 0.001 or 10**-3
• - micro (u) = 1/1,000,000 or 0.000001 or 10**-6

a form of writing large and small numbers using a coefficient that is a least 1, but less than 10, followed by a power of 10

• a unit of time
• used in both SI and metric systems

the numbers recorded in a measurement

• all non-zero digits are always significant (last digit is always estimated)
• zeroes are significant if:
• - they fall between numbers
• - they fall after numbers and before or after a decimal point
• when multiplying or dividing:
• - round off your answer to the same # SFs as the term with the least # of SFs
• when adding or subtracting:
• - round off your answer to the same decimal position as the term with the least precision

SG = density of a substance / density of water (1.00 g/ml at 4 deg C)

• an indicator of the hotness or coldness of an object
• the average kinetic energy of a substance

• the amount of space occupied by a substance
• the amount of space something takes up