Ping-pong balls

If the kinetic theory is applicable to gases, we should expect pressure to be affected by other factors than the number of moles per unit volume. For example, the mass of the molecules and their velocities should be important, as well. After all, a baseball exerts more push on a catcher s mitt than would a ping-pong ball thrown with the same velocity. Also, a baseball exerts more push on the mitt if a fast ball is thrown rather than a slow ball. To see how the mass of the molecules and their velocities are dealt with in the kinetic theory, we must consider temperature. 

The de Broglie equation predicts that eveiy particle has wave characteristics. The wave properties of subatomic particles such as electrons and neutrons play important roles in their behavior, but larger particles such as Ping-Pong balls or automobiles do not behave like waves. The reason is the scale of the waves. For all except subatomic particles, the wavelengths involved are so short that we are unable to detect the wave properties. Example illustrates this. 

The wavelength of the electron is significant because it is about the same size as the radius of an atom, but the wavelength of the Ping-Pong ball is inconsequential compared to its size. 

C07-0019. Describe the differences between the properties of a free electron and those of a Ping-Pong ball. 

Many early motion pictures were recorded on film made from celluloid. Ping-Pong balls are among the few products still made... 

C15-0142. Red and white Ping-Pong balls with small Velcro patches are placed in an air-blowing machine like the ones used to scramble numbered balls in lottery drawings on TV. If red and white balls collide at the Velcro points, they stick together. When 20 red and 10 white balls are put in the machine, 4 pairs form after 2 minutes of blowing, (a) If 10 balls of each color had been placed in the machine, how many pairs would form under the same conditions (b) What if there were 20 red and 15 white balls (c) What if there were 10 red and 20 white balls (d) What if the machine had been crammed with 40 red and 20 white balls (e) Explain why the rates change with the numbers of balls. 

For a solid which exists as a powder, a useful mental concept is that of ping-pong balls of several colors. Here, we imagine that reaction results when the layers become mixed. Furthermore, reaction can only take place... 

The first of the thermoplastic synthetic polymers to be developed was celluloid, made by combining nitrated cellulose (pure cotton subjected to nitric acid) and camphor (C10H16O), a plasticizer. The motivation was a search for a replacement for the ivory used in making billiard balls. It became a commercial product circa 1865, and is still used for making ping-pong balls. 

We can represent groups of atoms or ions by models. For example, to hold two ping-pong balls together they must be stuck or connected by a rod. There likewise must be a connection between the sodium and chloride ions in table salt or between the hydrogen and oxygen atoms in water. This force of attraction that holds atoms or ions together is called a chemical bond. 

If you re sending something that will fit into any size box and are restricted only by the total volume, then you have more flexibility with the postal rules. For example, if you re sending Ping-Pong balls or nails, the shape of the box doesn t matter very much. 

Scorns are so small that the number of them in a baseball is roughly equal to the number of Ping-Pong balls that could fit inside a hollow sphere as big as Earth, as Figure 5.1 illustrates. 

If Earth were filled with nothing bur Ping-Pong balls, the number of balls would be roughly equal to the number of atoms in a baseball. Put differendy, if a baseball were the size of Earth, one of its atoms would be the size of a Ping-Pong ball. 

The number of balls in a given mass of Ping-Pong balls is very different from the number of balls in the same mass of golf balls. 

A Ping-Pong ball is 2/40, or 1/20, as massive as a golf ball. 

Why don t equal masses of golf balls and Ping-Pong balls contain the same number of balls ... 

As wonderful as celluloid was, it still had the major drawback of being highly flammable. Today, one of the few commercially available products made of celluloid is Ping-Pong balls, shown in Figure 18.8. 

Why does a freshly cut Ping-Pong ball smell of camphor ... 

The water has the greater mass, just as a bunch of golf balls has more mass than the same number of ping-pong balls. The water has about 9 times as much mass because each H 0 molecule (16 +1 + 1-18 amu) is about 9 times as massive as each H2 molecule (1 + 1=2 amu) 18 amu/... 

The mass of the electron The lighter the particle, the greater its deflection. (Just as it s easier to deflect a Ping-Pong ball than a bowling ball.)... 

This glass window can be broken by a single baseball, but a thousand Ping-Pong balls would only bounce off. 

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