| 11. | The vacuum capability of the facility enables the use of high expansion ratio nozzles with the arc heater.
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| 12. | In general, the efficiency of the evaporation engine increases with the inlet temperature and the expansion ratio.
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| 13. | Recent improvements allow better quality results at all compression / expansion ratios but a residual smearing effect still remains.
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| 14. | The extent to which it does so is known as the "'expansion ratio " '.
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| 15. | The low pressure expansion cylinder is adjustable to maintain the best expansion ratio, regardless of the compression ratio.
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| 16. | Heat shrink tubing is rated by its expansion ratio, a comparison of the differences in expansion and recovery rate.
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| 17. | Advanced aerospike or plug nozzle, attempt to minimize performance losses by adjusting to varying expansion ratio caused by changing altitude.
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| 18. | The nozzle has an expansion ratio of 25 : 1, which is optimized for the upper part of the atmosphere.
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| 19. | A different nozzle, with an expansion ratio of 10 : 1, is used for test firing on the ground.
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| 20. | Beyond a certain point, further increasing the expansion ratio will actually decrease efficiency due to the increased heating and cooling.
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