thermosphere: meaning, definition, pronunciation and examples
Low frequency (specialized term)Technical/Scientific; Formal
Quick answer
What does “thermosphere” mean?
The layer of the Earth's atmosphere located above the mesosphere, characterized by a rapid increase in temperature with height, extending from about 85 km to the edge of space.
Audio
Pronunciation
Definition
Meaning and Definition
The layer of the Earth's atmosphere located above the mesosphere, characterized by a rapid increase in temperature with height, extending from about 85 km to the edge of space.
In planetary science, the equivalent high-temperature atmospheric layer on other celestial bodies. Metaphorically, can refer to a highly rarefied or theoretical environment.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or spelling differences. Pronunciation may show slight variation in secondary stress.
Connotations
Purely scientific term with identical neutral connotation in both varieties.
Frequency
Equally low-frequency and specialized in both UK and US English.
Grammar
How to Use “thermosphere” in a Sentence
The thermosphere + [verb: begins, extends, absorbs]In/within the thermosphereTemperature/ionization in the thermosphereVocabulary
Collocations
Examples
Examples of “thermosphere” in a Sentence
adjective
British English
- thermospheric phenomena
- thermospheric density measurements
American English
- thermospheric behavior
- thermospheric heating event
Usage
Meaning in Context
Business
Not used.
Academic
Used in textbooks and research papers on atmospheric science, geophysics, and space weather.
Everyday
Rarely used outside educational contexts (e.g., school projects, documentaries).
Technical
Core term in meteorology, climatology, aeronomy, and satellite operations (orbital drag calculations).
Vocabulary
Synonyms of “thermosphere”
Strong
Neutral
Weak
Vocabulary
Antonyms of “thermosphere”
Watch out
Common Mistakes When Using “thermosphere”
- Misspelling as 'thermosphear' or 'thermosfere'.
- Confusing it with the stratosphere or mesosphere.
- Assuming it is the hottest layer at all times (temperature is high but density extremely low, so it feels very cold).
FAQ
Frequently Asked Questions
Yes, temperatures can reach over 1500°C, but the air is so thin that it would not feel 'hot' to an object; heat transfer is negligible.
No, the atmosphere is far too thin to support breathing or human life without a pressurised suit and oxygen supply.
The thermosphere is defined by temperature, the ionosphere by the presence of ions and free electrons. They largely overlap but are defined by different properties.
It typically extends from about 85 kilometres (53 miles) above Earth to between 500 and 1000 km, where it merges with the exosphere.
The layer of the Earth's atmosphere located above the mesosphere, characterized by a rapid increase in temperature with height, extending from about 85 km to the edge of space.
Thermosphere is usually technical/scientific; formal in register.
Thermosphere: in British English it is pronounced /ˈθɜː.mə.sfɪə/, and in American English it is pronounced /ˈθɝː.moʊ.sfɪr/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'THERMO' (heat) + 'SPHERE' (layer/ball). It's the sphere where temperature soars.
Conceptual Metaphor
A protective thermal blanket shielding the lower atmosphere; a scorching frontier before outer space.
Practice
Quiz
What is the defining characteristic of the thermosphere?