diff --git a/includes/interface.h b/includes/interface.h
index 61e865e9d..c1e48f1d6 100644
--- a/includes/interface.h
+++ b/includes/interface.h
@@ -74,7 +74,7 @@ static menu_section msections[] = //doshow does not do anything currently.
 	{"\xD6", "Powered Materials", 0, 1},
 	{"\xE2", "Force Creating", 0, 1},
 	{"\xC3", "Explosives", 0, 1},
-	{"\xC5", "Gasses", 0, 1},
+	{"\xC5", "Gases", 0, 1},
 	{"\xC4", "Liquids", 0, 1},
 	{"\xD0", "Powders", 0, 1},
 	{"\xD1", "Solids", 0, 1},
diff --git a/includes/powder.h b/includes/powder.h
index 3488d2825..dcf5d0322 100644
--- a/includes/powder.h
+++ b/includes/powder.h
@@ -253,7 +253,7 @@
 #define TYPE_PART			0x00001 //1 Powders
 #define TYPE_LIQUID			0x00002 //2 Liquids
 #define TYPE_SOLID			0x00004 //4 Solids
-#define TYPE_GAS			0x00008 //8 Gasses (Includes plasma)
+#define TYPE_GAS			0x00008 //8 Gases (Includes plasma)
 #define TYPE_ENERGY			0x00010 //16 Energy (Thunder, Light, Neutrons etc.)
 #define PROP_CONDUCTS		0x00020 //32 Conducts electricity
 #define PROP_BLACK			0x00040 //64 Absorbs Photons (not currently implemented or used, a photwl attribute might be better)
@@ -726,17 +726,17 @@ static wall_type wtypes[] =
 	{PIXPACK(0x808080), PIXPACK(0x000000), 0, "Erases walls."},
 	{PIXPACK(0x808080), PIXPACK(0x000000), 3, "Wall. Indestructible. Blocks everything."},
 	{PIXPACK(0x3C3C3C), PIXPACK(0x000000), 1, "Wall. Indestructible. Blocks particles, allows air"},
-	{PIXPACK(0x575757), PIXPACK(0x000000), 1, "Wall. Indestructible. Blocks liquids and gasses, allows powders"},
+	{PIXPACK(0x575757), PIXPACK(0x000000), 1, "Wall. Indestructible. Blocks liquids and gases, allows powders"},
 	{PIXPACK(0xFFFF22), PIXPACK(0x101010), 2, "Conductor, allows particles, conducts electricity"},
 	{PIXPACK(0x242424), PIXPACK(0x101010), 0, "E-Hole, absorbs particles, release them when powered"},
 	{PIXPACK(0xFFFFFF), PIXPACK(0x000000), -1, "Air, creates airflow and pressure"},
-	{PIXPACK(0xFFBB00), PIXPACK(0x000000), -1, "Heats the targetted element."},
-	{PIXPACK(0x00BBFF), PIXPACK(0x000000), -1, "Cools the targetted element."},
+	{PIXPACK(0xFFBB00), PIXPACK(0x000000), -1, "Heats the targeted element."},
+	{PIXPACK(0x00BBFF), PIXPACK(0x000000), -1, "Cools the targeted element."},
 	{PIXPACK(0x303030), PIXPACK(0x000000), -1, "Vacuum, reduces air pressure."},
-	{PIXPACK(0x579777), PIXPACK(0x000000), 1, "Wall. Indestructible. Blocks liquids and solids, allows gasses"},
+	{PIXPACK(0x579777), PIXPACK(0x000000), 1, "Wall. Indestructible. Blocks liquids and solids, allows gases"},
 	{PIXPACK(0x000000), PIXPACK(0x000000), -1, "Drag tool"},
 	{PIXPACK(0xFFEE00), PIXPACK(0xAA9900), 4, "Gravity wall"},
-	{PIXPACK(0x0000BB), PIXPACK(0x000000), -1, "Postive gravity tool."},
+	{PIXPACK(0x0000BB), PIXPACK(0x000000), -1, "Positive gravity tool."},
 	{PIXPACK(0x000099), PIXPACK(0x000000), -1, "Negative gravity tool."},
 	{PIXPACK(0xFFAA00), PIXPACK(0xAA5500), 4, "Energy wall, allows only energy type particles to pass"},
 	{PIXPACK(0xFFAA00), PIXPACK(0xAA5500), -1, "Property edit tool"},
diff --git a/src/main.c b/src/main.c
index bd9962c0e..ee7f6c227 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2670,7 +2670,7 @@ int main(int argc, char *argv[])
 			if (REPLACE_MODE)
 				strappend(uitext, " [REPLACE MODE]");
 			if (sdl_mod&(KMOD_CAPS))
-				strappend(uitext, " [CAP LOCKS]");
+				strappend(uitext, " [CAPS LOCK]");
 			if (GRID_MODE)
 			{
 				char gridtext[15];
diff --git a/src/powder.c b/src/powder.c
index 68e199b0c..dfde2253a 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -1853,7 +1853,7 @@ void update_particles_i(pixel *vid, int start, int inc)
 			parts[i].vy += ptypes[t].advection*vy[y/CELL][x/CELL] + pGravY;
 
 
-			if (ptypes[t].diffusion)//the random diffusion that gasses have
+			if (ptypes[t].diffusion)//the random diffusion that gases have
 			{
 #ifdef REALISTIC
 				//The magic number controlls diffusion speed
@@ -2465,7 +2465,7 @@ killed:
 			}
 			else if (ptypes[t].falldown==0)
 			{
-				// gasses and solids (but not powders)
+				// gases and solids (but not powders)
 				if (!do_move(i, x, y, fin_xf, fin_yf))
 				{
 					if (parts[i].type == PT_NONE)