![]() ![]() ![]() Below is an example using the URL for this blog entry: /security-awareness-training/blog/secure-options-url-shorteninginto this shortened URL: This is very useful for when you need a short URLs, such as for Twitter, when you have to read a URL over the phone, or for a. As most of you know, URL shortening is when you use a service such as bit.ly or to take a very long URL and condense it into a very short URL. One of the recent lessons I learned was on URL shortening. These interactions not only get me thinking, but in the long run they help us produce a better newsletter. One of the things I love about the OUCH! security awareness newsletter is the community feedback we get, such as questions on why we picked a certain topic, why we focused on the lessons we did or suggestions on how to improve the overall format. But that "heavy" cloud is floating over your head because the air below it is even heavier- the lesser density of the cloud allows it to float on the dryer and denser air.Immediately apply the skills and techniques learned in SANS courses, ranges, and summits That is about 500,000 kilograms or 1.1 million pounds (about 551 tons). Global distribution of atmospheric waterĭoing the math: 1,000,000,000 x 0.5 = 500,000,000 grams of water droplets in our cloud. But that "heavy" cloud is floating over your head because the air below it is even heavier- the lesser density of the cloud allows it to float on the dryer and denser air. A 1 km 3 cloud contains 1 billion cubic meters.ĭoing the math: 1,000,000,000 x 0.5 = 500,000,000 grams of water droplets in our cloud. One estimate of cumulus cloud density is given at, as a density of about 0.5 gram per cubic meter. We're only going to look at the weight of the actual cloud particles. The weight of the water droplets plus the weight of the air (mostly above the cloud, pressing down).The weight of the water droplets in the cloud.Before we do, there's one more thing to consider. We still need to answer the question of how much a cloud weighs. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air. If clouds are made up of particles, then they must have weight and density.īut why do clouds float? The density of the same volume of cloud material is less than the density of the same amount of dry air. Since air has weight, it must also have density, which is the weight for a specific volume, such as a cubic inch or cubic meter. A barometer and air pressure will tell us that air does have weight! At sea level, the weight (pressure) of air is about 14 ½ pounds per square inch (1 kilogram per square centimeter). If all the water in the atmosphere rained down at once, it would only cover the globe to a depth of 2.5 centimeters, about 1 inch.ĭo you think clouds have any weight? How can they, if they are floating in the air like a balloon filled with helium? If you tie a helium balloon to a kitchen scale it won't register any weight, so why should a cloud? To answer this question, let's explore first if air has any weight. That may sound like a lot, but it is only about 0.001 percent of the total Earth's water volume of about 332,500,000 mi 3 (1,385,000,000 km 3), as shown in the table below. One estimate of the volume of water in the atmosphere at any one time is about 3,100 cubic miles (mi 3) or 12,900 cubic kilometers (km 3). Clouds are, of course, the most visible manifestation of atmospheric water, but even clear air contains water - water in particles that are too small to be seen. About 90 percent of water in the atmosphere is produced by evaporation from water bodies, while the other 10 percent comes from transpiration from plants. Strong winds move the clouds around the world until the water falls as precipitation, replenishing the earthbound parts of the water cycle. Cooler temperatures aloft allow the vapor to condense into clouds. Evaporation and transpiration transform liquid water into vapor, which ascends into the atmosphere due to rising air currents. Although the atmosphere may not be a great storehouse of water, it is the superhighway used to move water around the globe. The water cycle is all about storing water and moving water on, in, and above the Earth. Surface runoff The atmosphere is full of water. ![]()
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