The Measurement of Matter (1.3.1) Flashcards
A measurement is meaningless unless it has units associated with it.
A measurement is meaningless unless it has units associated with it.
The Systèm International d’Unités (SI) was developed as a convenient and uniform system of measurement.
The Systèm International d’Unités (SI) was developed as a convenient and uniform system of measurement.
Some SI units are based on amounts that are too large or small to be useful for chemists, so units derived from SI units are commonly used.
Some SI units are based on amounts that are too large or small to be useful for chemists, so units derived from SI units are commonly used.
A measurement is meaningless unless is has units
associated with it. For example, describing the
length of a football field as “100” is insufficient. The
length should be given as “100 yards”.
A measurement is meaningless unless is has units
associated with it. For example, describing the
length of a football field as “100” is insufficient. The
length should be given as “100 yards”.
The Systèm International d’Unités (SI) was
developed as a convenient and uniform system of
measurement.
All SI units are built upon seven base SI units.
These units are the meter (length), the kilogram
(mass), the kelvin (temperature), the mole
(chemical amount), the ampere (electric current),
and the candela (luminous intensity).
The Systèm International d’Unités (SI) was
developed as a convenient and uniform system of
measurement.
All SI units are built upon seven base SI units.
These units are the meter (length), the kilogram
(mass), the kelvin (temperature), the mole
(chemical amount), the ampere (electric current),
and the candela (luminous intensity).
Derived units are units obtained by combining two
or more of the base SI units. For example, the
joule is a unit of energy that combines kilograms,
meters, and seconds.
Derived units include the joule (energy), the Newton
(force), the watt (power), the pascal (pressure),
the coulomb (electric charge), and the volt (electric
potential difference).
Derived units are units obtained by combining two
or more of the base SI units. For example, the
joule is a unit of energy that combines kilograms,
meters, and seconds.
Derived units include the joule (energy), the Newton
(force), the watt (power), the pascal (pressure),
the coulomb (electric charge), and the volt (electric
potential difference).
Greek prefixes are used to modify SI units. For
example, one kilometer (km) is equal to 103
meters (one thousand meters).
Greek prefixes can be used with any base SI unit
except the kelvin. For example, if a very small
chemical amount is being measured, it might be
given in picomoles (pmol), or 10–12 moles (one
trillionth of a mole).
Although the base SI unit of mass is the kilogram,
Greek prefixes are used to modify grams. For
example, one milligram (mg) is equal to 10–3 grams
(one thousandth of a gram), or one millionth of a
kilogram.
Greek prefixes are used to modify SI units. For
example, one kilometer (km) is equal to 103
meters (one thousand meters).
Greek prefixes can be used with any base SI unit
except the kelvin. For example, if a very small
chemical amount is being measured, it might be
given in picomoles (pmol), or 10–12 moles (one
trillionth of a mole).
Although the base SI unit of mass is the kilogram,
Greek prefixes are used to modify grams. For
example, one milligram (mg) is equal to 10–3 grams
(one thousandth of a gram), or one millionth of a
kilogram.
Some SI units are based on amounts that are too
large or small to be useful for chemists, so units
derived from SI units are commonly used.
Some SI units are based on amounts that are too
large or small to be useful for chemists, so units
derived from SI units are commonly used.
A unit commonly used for temperature is the degree
Celsius (˚C). To convert from temperature in
kelvins to temperature in degrees Celsius, subtract
273.15. However, many calculations in chemistry
require that the temperature be in kelvins.
A unit commonly used for pressure is the
atmosphere (atm), which is equal to 101,325
pascals. The atmospheric pressure at sea level is
one atmosphere, making this unit very convenient.
A unit commonly used for temperature is the degree
Celsius (˚C). To convert from temperature in
kelvins to temperature in degrees Celsius, subtract
273.15. However, many calculations in chemistry
require that the temperature be in kelvins.
A unit commonly used for pressure is the
atmosphere (atm), which is equal to 101,325
pascals. The atmospheric pressure at sea level is
one atmosphere, making this unit very convenient.
The unit commonly used by chemists for volume is
the liter (L), which is equal to 10^–3m^3
.
The unit commonly used for mass is the gram (g),
which is equal to 10^–3 kilograms.
The unit commonly used by chemists for volume is
the liter (L), which is equal to 10^–3m^3
.
The unit commonly used for mass is the gram (g),
which is equal to 10^–3 kilograms.
