Chinese inventions gunpowder rockets
Remember, then, Nathan and Rollo, that, when a fire is built in a fireplace, so as to warm the air in the chimney, it makes this air not so heavy and then the cool air all around it in the room and out of doors, presses in, and crowds under the light air, and makes it ascend.But water is not compressed, and chinese inventions gunpowder rockets has no tendency to expand.What is it? said James.Yes, replied his father, but then the column of it chinese inventions gunpowder rockets is very high.How high did it go? said Nathan.He filled it with hot air and the hot air was so light, that it chinese inventions gunpowder rockets rose up and carried the paper ball with it.How can that crowd it up? Why, it presses in through all the crevices and openings all around the room, and crowds the light air up the chimney.No, Jonas, chinese inventions gunpowder rockets said Nathan, we do really want to know.How heavy? said Rollo.O, it soared away, said his father, away up into the air, very high until at length it got cool, chinese inventions gunpowder rockets and then it came down.Why, if a man were to press the piston down hard, he could crowd the air all into the lower half of the cylinder.How do they know, chinese inventions gunpowder rockets then, how high it is? said Rollo.He understood all that I have been explaining to you about the air being light when it was hot.
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