One of the mysteries of the English language finally explained.
The limitation of the speed of an aircraft or other flying object by heat resulting from air friction.
- ‘However, he further maintains that we have also reached a moment when humans, who have already surpassed the sound and heat barriers, are left with nothing to race against but speed of light - something which can never be surpassed.’
- ‘The result is a virtually invisible sound and heat barrier.’
heat barrier/hēt ˈberēər/
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