1 files changed, 37 insertions, 0 deletions
diff --git a/unit.c b/unit.c
index 316a39a..9e03abf 100644
--- a/unit.c
+++ b/unit.c
@@ -12,6 +12,12 @@
 /* Metres per inch. */
 #define M_PER_IN 0.0254
 
+/* Metres per foot. */
+#define M_PER_FT 0.3048
+
+/* Seconds per minute. */
+#define SEC_PER_MIN 60.0
+
 
 AngularSpeed
 rad_per_sec(double x) {
@@ -133,3 +139,34 @@ double
 as_cubic_inch(double x) {
 	return x / 1.6387064e-5;
 }
+
+
+VolumeFlowRate
+cubic_metre_per_sec(double x) {
+	return x;
+}
+
+VolumeFlowRate
+cubic_metre_per_min(double x) {
+	return x / SEC_PER_MIN;
+}
+
+VolumeFlowRate
+cubic_foot_per_min(double x) {
+	return x * pow(M_PER_FT, 3) / SEC_PER_MIN;
+}
+
+double
+as_cubic_metre_per_sec(VolumeFlowRate x) {
+	return x;
+}
+
+double
+as_cubic_metre_per_min(VolumeFlowRate x) {
+	return x * SEC_PER_MIN;
+}
+
+double
+as_cubic_foot_per_min(VolumeFlowRate x) {
+	return x * SEC_PER_MIN / pow(M_PER_FT, 3);
+}