Definition

Noun: A unit of temperature measurement equal to one thousandth (1/1000) of a degree. It is used to express very small temperature differences or precise measurements.

Usage

The term "millidegree" is a scientific and technical term. It is used in contexts requiring high precision, such as physics experiments, materials science, engineering, and climate research, where temperature changes are extremely small. - It is typically used with temperature scales like Celsius or Kelvin (e.g., millidegrees Celsius, m°C; millidegrees Kelvin, mK). - It functions as a standard unit of measurement in precise data reporting.

Examples

• The experiment required the sample to be cooled with a stability of a few millidegrees.
• The temperature of the cosmic microwave background is measured with an accuracy of microkelvins, which is a thousandth of a millidegree.
• A change of just 50 millidegrees Celsius can significantly affect the chemical reaction rate.

Advanced Usage

• "Millidegree precision": Refers to the capability of measuring or controlling temperature to within a thousandth of a degree.
  • The crystal growth process requires millidegree precision in the furnace's temperature control.
• Used in compound units like "millidegree per second" to describe very slow rates of temperature change.

Variants and Related Words

• Millikelvin (mK): A more common precise unit in physics, equal to one thousandth of a kelvin. Note: A change of 1 mK is equal to a change of 1 millidegree Celsius.
• Microdegree: A unit equal to one millionth of a degree, representing an even finer measurement.

Synonyms

• Thousandth of a degree (descriptive synonym)
• m°C (symbol for millidegrees Celsius)
• mK (symbol for millikelvin, functionally equivalent for expressing temperature intervals)

Notes on Meaning

• Millidegree specifically denotes a for temperature or interval, not an absolute point on a scale. For example, "an increase of 200 millidegrees" is correct, while "a temperature of 200 millidegrees" is ambiguous without a defined zero point.
• It is a compound word formed from the SI prefix "milli-" (meaning one-thousandth) and "degree".

Noun

1. a unit of temperature equal to one-thousandth of a degree