First Lessons in Natural Philosophy for Beginners

If one hand be held in quite warm water, and the other in quite cold water, for a few moments, and then both hands be plunged into tepid water, the tepid water will feel cold to...

In a large heap of wool, the hairs of the wool at the bottom of the heap are pressed closely together, but they are farther and farther apart the nearer they are to the top of t...

If a sunbeam, shining through a hole in the window-shutter of a dark room, should fall upon a prism, it will be broken up as it passes through the prism, and be shown on the opp...

The tender buds and blossoms are kept back in the spring until the ice and the snow are melted, and the earth becomes warmed, so that they are seldom injured by the cold.

When lead is melted and poured through a sieve at the top of a high tower, the attraction of cohesion forms it into round drops or globules; these cool, while falling, thus form...

In Fig. 45, the distance from the fulcrum to the power is ten times the distance from the fulcrum to the weight; now, if the small body weighs one pound, how much must the large...

On the top of a high mountain the human voice is heard only at a distance of a few yards; and a pistol when exploded sounds as faintly as the breaking of a stick.

When it is morning to us, it is evening to them; when it is day-time to us, it is night-time to them; and when it is noon to us, it is midnight to them.

When a boat moves across a river at the rate of four miles an hour, and the current runs four miles an hour, in what direction will the boat go?

The positive end of one magnet always attracts the negative end of every other magnet; but if the two positive or the two negative ends are brought together, they will repel eac...

Because the substance of the ball is pressed out of shape when it strikes the floor, and, in its effort to spring back to its former shape, it is forced to rebound.

Sources of Heat 42 Expansion by Heat 46 Conduction of Heat 54 Convection of Heat 59 Liquefaction 61 Latent Heat 63 Ebullition 65 Vaporization 66 Evaporation 69 Radiation 71 Refl...