Temperature is usually measured in degrees Celsius. The Celsius
temperature scale was previously known as the centigrade scale.
The degree Celsius (symbol: °C) can refer to a specific
temperature on the Celsius scale as well as serve as a unit
increment to indicate a temperature interval (a difference
between two temperatures or an uncertainty). Celsius is named
after the Swedish astronomer Anders Celsius (1701–1744),
who developed a similar temperature scale.
For example water
boils at 100°C and freezes at 0°C. The normal human body temperature
is about 37°C.
acre is often used to express areas of land. In the metric
system, the hectare is commonly used for the same purpose.
An acre is approximately 40% of a hectare. One acre is 90.75
yards of a 53.33 yard wide American football field. The full
field, including the end zones, covers approximately 1.32