How do the following factors affect, if at all, the speed of sound in air:
Pressure of air

Explanation

**Step-by-Step Solution:**

1. **Understanding Sound Propagation**: Sound is a mechanical wave that travels through a medium, such as air. The speed of sound in air is influenced by various factors, including temperature, humidity, and the medium's density.

2. **Examining the Role of Pressure**: When we consider the pressure of air, we need to understand that sound travels through the vibration of air molecules. Increasing the pressure of air means that the air molecules are closer together.

3. **Effect of Pressure on Density**: While increasing pressure does increase the density of air, it also increases the temperature of the air if the volume is kept constant. The speed of sound is primarily affected by the temperature of the medium.

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