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20 Euros Faster than Sound
| Issuer | Münze Österreich (Austrian Mint) |
|---|---|
| Year | 2020 |
| Type | Non-circulating coin |
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|---|---|
| Obverse script | Latin |
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| Reverse lettering | CONCORDE 330 340 350 000 010 020 50 060 070 080 090 100 200 190 180 170 160 150 140 |
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| Additional information |
Austria's "Science and Technology" commemorative series has been running since 2002, and this entry marks the centenary of sustained supersonic research that preceded Chuck Yeager's 1947 barrier-breaking flight by decades — Ernst Mach having done the foundational work in Vienna in the 1880s. The Mach number itself, the ratio of an object's speed to the speed of sound, was named posthumously by physicist Jakob Ackeret in 1929.
Münze Österreich struck this as a niobium-free silver issue, unusual for a series that frequently employs bimetallic niobium construction.