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58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#ifndef GAS_H
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#define GAS_H
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#include "units.h"
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#ifdef __cplusplus
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extern "C" {
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#else
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#include <stdbool.h>
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#endif
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// o2 == 0 && he == 0 -> air
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// o2 < 0 -> invalid
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struct gasmix {
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fraction_t o2;
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fraction_t he;
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};
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static const struct gasmix gasmix_invalid = { { -1 }, { -1 } };
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static const struct gasmix gasmix_air = { { 0 }, { 0 } };
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struct icd_data { // This structure provides communication between function isobaric_counterdiffusion() and the calling software.
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int dN2; // The change in fraction (permille) of nitrogen during the change
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int dHe; // The change in fraction (permille) of helium during the change
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};
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extern bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results);
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extern double gas_compressibility_factor(struct gasmix gas, double bar);
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extern double isothermal_pressure(struct gasmix gas, double p1, int volume1, int volume2);
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extern double gas_density(struct gasmix gas, int pressure);
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extern int same_gasmix(struct gasmix a, struct gasmix b);
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static inline int get_o2(struct gasmix mix)
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{
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return mix.o2.permille ?: O2_IN_AIR;
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}
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static inline int get_he(struct gasmix mix)
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{
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return mix.he.permille;
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}
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struct gas_pressures {
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double o2, n2, he;
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};
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extern void sanitize_gasmix(struct gasmix *mix);
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extern int gasmix_distance(struct gasmix a, struct gasmix b);
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extern bool gasmix_is_air(struct gasmix gasmix);
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#ifdef __cplusplus
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}
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#endif
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#endif
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