**United States customary units** are a system of measurements commonly used in the United States. The U.S. customary system developed from English units which were in use in the British Empire before American independence. Consequently most U.S. units are virtually identical to the British imperial units. However, the British system was overhauled in 1824, changing the definitions of some units used there, so several differences exist between the two systems.

The majority of U.S. customary units were redefined in terms of the meter and the kilogram with the Mendenhall Order of 1893, and in practice, for many years before. These definitions were refined by the international yard and pound agreement of 1959. The U.S. primarily uses customary units in its commercial activities, while science, medicine, government, and many sectors of industry use metric units. The SI metric system, or International System of Units is preferred for many uses by NIST

The system of **imperial units** or the **imperial system** (also known as **British Imperial**) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced. The system came into official use across the British Empire. By the late 20th century, most nations of the former empire had officially adopted the metric system as their main system of measurement, but some Imperial units are still used in the United Kingdom and Canada.

**Celsius**
**Degree**
**Fahrenheit**

In music, a **scale** is any set of musical notes ordered by fundamental frequency or pitch. A scale ordered by increasing pitch is an ascending scale, while descending scales are ordered by decreasing pitch. Some scales contain different pitches when ascending than when descending (for instance, see Chromatic scale and Melodic minor scale).

Often, especially in the context of the common practice period, part or all of a musical work including melody and/or harmony, is built using the notes of a single scale, which can be conveniently represented on a staff with a standard key signature.

In thermodynamics, a **state function**, **function of state**, **state quantity**, or **state variable** is a property of a system that depends only on the current state of the system, not on the way in which the system acquired that state (independent of path). A state function describes the equilibrium state of a system. For example, internal energy, enthalpy, and entropy are *state quantities* because they describe quantitatively an equilibrium state of a thermodynamic system, irrespective of how the system arrived in that state. In contrast, mechanical work and heat are process quantities because their values depend on the specific *transition* (or path) between two equilibrium states.

The opposite of a state function is a path function.

A **degree of frost** is a non-standard unit of measure for air temperature meaning degrees below melting point (also known as "freezing point") of water (32 degrees Fahrenheit or 0 degrees Celsius). "Degree" in this case can refer to degree Celsius or Fahrenheit.

When based on Celsius, 0 degrees of frost is the same as 0°C, and any other value is simply the negative of the Celsius temperature. When based on Fahrenheit, the conversion is a bit more complicated, as 0 degrees of frost is equal to 32°F. Conversion formulas:

**Thermodynamic temperature** is the absolute measure of temperature and it is one of the principal parameters of thermodynamics.

Thermodynamic temperature is defined by the second law of thermodynamics in which the theoretically lowest temperature is the null or zero point. At this point, called absolute zero, the particle constituents of matter have minimal motion and can become no colder. In the quantum-mechanical description, matter at absolute zero is in its ground state, which is its state of lowest energy. Thermodynamic temperature is therefore often also called **absolute temperature**.

- What is 1 degree Celsius in Fahrenheit?
- How many degrees Fahrenheit are in 1 degree Celsius?
- What is 27 degree below zero Fahrenheit in the Celsius scale?
- What does 1 Degree c equal in f?
- How many C degree is 20 F degree?
- Can ice be colder than 1 degree Celsius?
- If 9/5 degree fahrenheit is equal to 1 degree Celsius then can it also be said 5/9 f is equal to 1 degree Celsius?
- Does one degree on the celsius temoerature scale equal 1.8 degrees on the fahrenheit temperature scale?

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