Humidity is actually light for a projectile to fly through, because there is more hydrogen in humid air than in dry air, which contains a larger percentage of nitrogen. The common reputation of humidity is that it is heavy however, this is a misnomer. The effect of humidity on air density is very slight and is actually opposite what it is commonly purported to be. This is the biggest reason the public does not understand the impact of air density on sports. The actual barometric pressure when measured in inches of mercury, changes by approximately 1 inch per every 1,000 feet of elevation, so instead of 29.92 inches as at sea level, Denver, Colorado measures approximately 25.10 actual inches of mercury, but this is ignored by the weather monitoring and reporting services. However, the actual barometric pressure is far more substantial. However, at every altitude the actual barometric pressure is different, so it would be impossible to see the extremely small air pressure changes that occur hourly if there was no "standard." Therefore scientists adopted sea level pressure as a standard and the smaller pressure changes have become meaningful regardless of the altitude.
There is a good reason for this.weather systems can be and are identified by high pressure systems and low pressure systems moving around the earth. Similarly, one would probably need to be in the highest of mountain peaks, with the temperature approaching "hot," for the gauge to read near zero on the scale.Īctual Barometric Pressure at a given altitude is seldom (if ever) reported. One would probably be far below sea level and well into the Arctics' coldest air before the gauge would read above 100.
#Density of air professional#
The bulk of professional and non-professional sporting events will fit between 20.0 and 80.0 on the "Neeley Scale," so that rarely would an event approach the extremes of zero and 100. The scale will approach 100 at sea level as the air density becomes heavier, if it is very cold in temperature on a particular event day. Since air density is very light at the top of tall mountains, especially when the temperatures are warmer, the scale begins at zero at this elevation. However, the larger benefit is derived from the whole number as one compares performance or expectations between one geographical location and another. This cross-section is displayed on a 100 scale, which can then be divided into smaller increments of one or more decimals for extreme accuracy. The "Neeley Scale" represents a cross-section of the total atmosphere that which extends only from the mountain tops to sea level where sports using a projectile are typically played. However, sport is played by more non-scientific people than not, and a 100 scale fits athletes better for the most part. No doubt the traditional scientific scale works well for mathematical representations in scientific equations. Traditionally, earth scientists have used pounds per cubic foot (lb/ft 3) as the measure of air density.
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