emagram
Rare / SpecializedHighly Technical
Definition
Meaning
A type of thermodynamic diagram used primarily in meteorology to plot the vertical profile of atmospheric temperature and moisture.
In meteorology, an emagram (Energy-per-unit-mass diagram) is a chart with temperature on the x-axis and the logarithm of pressure on the y-axis, used for analyzing atmospheric stability, convective potential, and other thermodynamic properties of an air column.
Linguistics
Semantic Notes
Used exclusively within meteorology and atmospheric science. The term is jargon and is not known or used by the general public.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling is consistent.
Connotations
Purely technical term with no regional connotations.
Frequency
Equally rare in both UK and US English, confined to professional meteorological contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The meteorologist plotted [OBJECT: an emagram] from the radiosonde data.The [MODIFIER: skew-T] emagram showed high instability.Vocabulary
Synonyms
Strong
Neutral
Weak
Usage
Context Usage
Business
Not used.
Academic
Used in atmospheric science and meteorology research papers and textbooks.
Everyday
Not used.
Technical
Core term in operational meteorology and atmospheric physics for forecasting and analysis.
Examples
By Part of Speech
adjective
British English
- emagram analysis
- emagram plot
American English
- emagram data
- emagram interpretation
Examples
By CEFR Level
- The forecaster used an emagram to predict the chance of thunderstorms.
- An emagram helps to visualise temperature changes with height.
- The steep lapse rate evident on the emagram indicated a high potential for deep convection.
- By analysing the skew-T emagram, the meteorologist identified a capping inversion that would inhibit storm development until later in the day.
Learning
Memory Aids
Mnemonic
Think: 'EMA' like 'Energy per MAss' + 'GRAM' like 'diagram' = A diagram showing energy per unit mass in the atmosphere.
Conceptual Metaphor
A vertical 'map' or 'fingerprint' of the atmosphere's energy state.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'эмограмма' (not a standard term). The correct Russian equivalent is typically described as 'энергетическая диаграмма' or specified as 'диаграмма эмаграмма' in technical contexts.
- Avoid direct transliteration; it is a loaned technical term.
Common Mistakes
- Misspelling as 'emmagram' or 'emmegram'.
- Confusing it with a 'hodograph' (wind profile diagram) or a 'meteogram' (time-series chart).
- Using it as a general term for any weather chart.
Practice
Quiz
What is an 'emagram' primarily used for?
FAQ
Frequently Asked Questions
No, it is a highly specialised technical term used almost exclusively in meteorology and atmospheric science.
No, it would not be understood. In everyday contexts, simpler terms like 'weather chart' or 'forecast map' are used.
A skew-T log-P diagram is a specific, common type of emagram. 'Emagram' can be a more general term, but in modern usage, they are often synonymous.
Primarily meteorologists, atmospheric scientists, pilots (for aviation weather), and students in these fields.