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d
The symbol for the metric prefix deci.
da
The symbol for the metric prefix deca or deka, both mean the same thing.
dag
The symbol for the decagram or dekagram, both mean the same thing, a metric unit of mass equal to 10 grams.
dal
Alternate symbols: daL
The symbol for the decaliter or dekaliter, both mean the same thing, a metric unit of volume equal to 10 liters.
dam
The symbol for the decameter or dekameter, both mean the same thing, a metric unit of length equal to 10 meters.
deca
Symbol: da
A metric prefix equivalent to 10, the same as prefix deka.
decagram
Symbol: dag
A metric unit of mass equivalent to 10 grams, the same as the dekagram.
decaliter
Symbol: dal
Alternate symbols: daL
A metric unit of volume equivalent to 10 liters, the same as the dekaliter.
decameter
Symbol: dam
A metric unit of length equivalent to 10 meters, the same as the dekameter.
deci
Symbol: d
A metric prefix equivalent to 0.1
decigram
Symbol: dg
A metric unit of mass equivalent to 0.1 grams.
deciliter
Symbol: dl
Alternate symbols: dL
A metric unit of volume equivalent to 0.1 liters.
decimeter
Symbol: dm
A metric unit of length equivalent to 0.1 meters.
degree
Symbol: °
Alternate symbols: deg
When used by itself to describe temperature, degree means degree Fahrenheit in the U.S. and degree Celsius elsewhere.
degree Celsius
Symbol: °C
Alternate symbols: deg C
A very common metric unit of temperature, named after Swedish physicist Anders Celsius.

Originally the scale was defined with 0 °C being the freezing point of water, 100 ° C being the boiling point of water.

The official SI definition is that the temperature of the triple point of water, at which water can exist simultaneously in the gaseous, liquid, and solid states, is exactly 0.01 °C and the size of each degree is 1/273.16 between this temperature and absolute zero. This definition is nearly identical to the old definition.

With 100 degrees between the freezing point of water and the boiling point of water, the scale was originally called centigrade, centi being a metric prefix meaning one hundredth.

Anders Celsius, who's name graces this temperature scale, actually used an inverted scale. Where 0 was the boiling point of water and 100 was the freezing point of water.
The original yet obsolete name for the degree Celsius.
degree Fahrenheit
Symbol: °F
Alternate symbols: deg F
A traditional temperature scale still used in the United States, though seldom used elsewhere. The unit was named for Daniel G. Fahrenheit, a German physicist who invented the mercury thermometer. Originally, in 1724 it was defined as 0° as the coldest temperature he measure, then he made 100° what he thought was the temperature of his own body, though he was a bit inaccurate. Eventually the scale was defined as 32° being the freezing point of water and 212° being the boiling point of water.

Nearly every country has switched to the Celsius scale for describing temperatures, including the government and scientific communities within the United States. But because of the user-friendliness of the Fahrenheit scale, the civilian and commercial industries continue to use it, making it still the most popular temperature scale in the United States.
deka
Symbol: da
A metric prefix equivalent to 10, the same as the prefix deca.
dekagram
Symbol: dag
A metric unit of mass equivalent to 10 grams, the same as the decagram.
dekaliter
Symbol: dal
Alternate symbols: daL
A metric unit of volume equivalent to 10 liters, the same as the decaliter.
dekameter
Symbol: dam
A metric unit of length equivalent to 10 meters, the same as the decameter.
dg
The symbol for the decigram, a metric unit of mass equal to 0.1 grams.
dl
Alternate symbols: dL
The symbol for the deciliter, a metric unit of volume equal to 0.1 liters.
dm
The symbol for the decimeter, a metric unit of length equal to 0.1 meters.

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