1,000 cm^3 of water weighs 1,000 g @ 4°C.
Therefore
1 L of water @ 4°C weighs 1 kg,
and
1 mL of water @ 4°C weighs 1 g.Temperature Measurements
The most commonly used temperature scale in scientific work is the Celsius
scale. It gets its name from the Swedish astronomer Anders Celsius and dates
back to 1742. For a long time it was called the centigrade scale because it is
based on the concept of dividing the distance on a thermometer between the
freezing point of water and its boiling point into 100 equal markings or degrees.
Another scale is based on the lowest theoretical temperature (called
absolute zero). This temperature has never actually been reached, but scientists in
laboratories have reached temperatures within about a billionth of a degree above
absolute zero. Sir William Thomson, also known as Lord Kelvin, proposed this
scale on which a unit is the same size as a Celsius degree but where the zero mark
has been displaced lower. Consequently, it is referred to as the Kelvin
temperature scale. Through experiments and calculations, it has been determined
that absolute zero is 273.15 degrees below zero on the Celsius scale. This figure
is usually rounded off to −273°C.
The diagram and conversion formulas that follow give the graphic and
algebraic relationships among three temperature scales: the Celsius and Kelvin,
commonly used in chemistry, and the Fahrenheit.
TIP
Kelvin and °C units are used on the SAT test.