what does the word locomotive mean

Peter Cavell was a fit kid, who watched his diet and exercised regularly. But then, life placed in and started biting away at his priorities want it does with all of us. I mean, if you believe back to your younger years, the chances are you remember that you possessed additional free time and quite a few less responsibilities. Peter Carvell was the same, while life got busy, his fitness began to suffer. A tighter built home means less outside air infiltrating in the home, which in turn means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" the nearby air, which has to be "made up" with fresh air. If air cannot type in the home as quickly anymore, this could cause serious issues. As the surrounding air can be used for combustion, and not substituted for fresh air, a bad pressure in the space can take place. This could create combustion trouble for the furnace, plus consume fresh air for any person inside home.