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-rw-r--r--core/dive.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/core/dive.h b/core/dive.h
index 8798b22ff..3a1492ed9 100644
--- a/core/dive.h
+++ b/core/dive.h
@@ -136,6 +136,7 @@ extern int units_to_sac(double volume);
/* Volume in mliter of a cylinder at pressure 'p' */
extern int gas_volume(cylinder_t *cyl, pressure_t p);
extern double gas_compressibility_factor(struct gasmix *gas, double bar);
+extern double isothermal_pressure(struct gasmix *gas, double p1, int volume1, int volume2);
static inline int get_o2(const struct gasmix *mix)