How fast does liquid nitrogen expand

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Discussion Overview

The discussion revolves around the expansion of liquid nitrogen when heated, particularly in the context of exposure to gases at high temperatures, such as 3000 degrees Celsius. Participants explore the rates and factors influencing the expansion process, including temperature changes and specific volume calculations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the rate and extent of expansion of liquid nitrogen when heated by high-temperature gases.
  • Another participant humorously asserts that the expansion occurs "very fast," but does not provide specific details.
  • A third participant emphasizes the need for more information to provide a precise answer, noting that the rate of expansion depends on factors such as the temperature of the incoming gas and the rate of energy transfer.
  • A later reply provides estimates for the expansion, indicating that while there is minimal change in specific volume when increasing the temperature of liquid nitrogen slightly, transitioning from liquid to gas results in a significant expansion factor of about 180, and further expansion from gas at 77K to gas at 3273K results in an additional factor of about 43, leading to a total increase in specific volume by a factor of approximately 7700.

Areas of Agreement / Disagreement

Participants express differing levels of specificity regarding the expansion of liquid nitrogen, with some providing numerical estimates while others highlight the complexity of the factors involved. There is no consensus on a definitive rate of expansion.

Contextual Notes

The discussion lacks detailed assumptions about the conditions under which the expansion occurs, such as the rate of heating and the specific setup of the experiment. Additionally, the calculations presented depend on specific temperature ranges and may not account for all variables involved in the expansion process.

Who May Find This Useful

Individuals interested in thermodynamics, cryogenics, or the behavior of gases and liquids at varying temperatures may find this discussion relevant.

strawmilk
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i would like to know how fast and how much liquid nitrogen (-200 degrees Celsius) expands when it is heated with gasses of about 3000 degrees Celsius
 
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Veeerrrrryyyyyy fast!
 
Without more info, we can't be any more specific than that. It isn't just a matter of how hot the gas going in is, but how fast it is percolated through (and therefore how fast energy is put in).
 
See posts #2 and 3 for how fast. As for how much - that can be easily estimated. In going from liquid at 73K to liquid at 77K, there is hardly any change in specific volume. In going from liquid to gas at 77K, there's an expansion by a factor of about 180. And in going from gas at 77K to gas at 3273K, there's a further expansion of a factor of about 43. The net increase in specific volume is thus, a factor of about 7700.
 

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