Example applications range from hypersonic aerodynamics in rarefied gas flows to plasma flows. Compared to Earth, the atmosphere of Mars is quite rarefied. Its sonorities are sparse and monochrome, its air rarefied and bracing. A gradual process of diffusion into less rarefied musical circles seems underway. Spectroscopic observations thus showed that nebulae were made of extremely rarefied gas. Generally however, the deeper the cave becomes, the more rarefied the ecology. Television science fiction, he felt, had become too pristine and rarefied. There is little moisture to temper the effects of rarefied air. Florentine food grows out of a tradition of peasant eating rather than rarefied high cooking. The methanide anion (CH) exists only in rarefied gas phase or under exotic conditions. "The Guardian" said "her depiction of the rarefied art world is gripping". Argon is one example of a commonly used rarefied gas. Nikola Tesla (1899 December) theorized that the balls consist of highly rarefied (but hot) gas. The ethanium ion has been studied as an extremely rarefied gas by infrared spectroscopy. In these rarefied flows, the Navier-Stokes equations can be inaccurate.