Instead of 'own' (because I know some responsible dog breeders will co-own males/females-where they won't live with them) I should say how many males and females should a responsible dog breeder have on their home/property? What is a reasonable amount and what would be too many?
Inside the rocket, you burn fuel. The reaction is very energetic. But the only place for this gas to go is out the back of the rocket. The action is exhaust coming out of the rocket. The reaction is the rocket going forward. The rocket doesn't need air to push on precisely due to Newton's Third law. Everything needed to make the rocket go is within the rocket itself. Gas is being shot out of the rocket. So the rocket doesn't work by pushing on anything.
Hook is right. The only sure fire way to use a vapor that will not rise. Dry ice in hot water should work nicely. Hope this helps.
PIPE size is same what is completely different is american thread npt etc as uk and most world work on bsp thread there is no conversion for threads .
If your just wanting to change them to mm this site has a table with the actual sizes and the metric conversion
