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Steam pressure was first harnessed about two thousand years ago, and has been used in many different ways. There are many practical implementations of steam power throughout history, and pressure canners are only one of the many applications with food preparation being perhaps the simplest. Pressure washers use steam to create an environment that will dislodge dirt and debris from surfaces that tend to allow contaminants to cling to their finish. Just about anything can be cleaned with steam, but one serious application is in the health industry where sterilizing the environment is needed for medical reasons. In this case, steam is the best method of killing germs and harmful bacteria that can cause a long list of ailments. Another health related application is in respiratory units where breathing conditions must be improved. Steam can be used to force decongestants into the air which patients breathe to dislodge congestion in their lungs. Without the use of steam it would not be possible to get these medications into the bronchial system where they can improve the lung capacity of the patient. Steam has been used in the garment industry, too. Use of steam irons takes the wrinkles out of clothing, and leaves a very nice and attractive finish as a result. Stream application to clothing is also an excellent means of removing soil and other dirt from the cloth. Steam has been used in the laundry business for many years to provide superior results for the public. Mass transit found the use of steam to be very practical in powering locomotives, otherwise known and trains with steam engines. They pulled heavily loaded cargo cars up long inclines to get around and over tall mountains. Other things like farming equipment found the steam engine to be a very good means of obtaining more yield per hour. Even fire trucks were once powered by the steam engine thereby replacing the horse as the means of power. Mining various minerals and other compounds was also visited by the use of steam power to move earth out of the way, while reducing the treat of injury to mine workers. In this case, it took far less humans to get the mining job done and removed the possibility of cave collapse in the mining business. After the ore was exposed and gathered, the steam engine was used to pull the heavy loads out of the mining area and deliver it to the processing centers. The use of steam has been most instrumental throughout history in providing the power needed to replace large numbers of workers and therefore reduce the cost of doing business. Its impact on society has been measured by the results it produced and how quickly industry implemented its use. Without the power of steam there would not have been expansion into otherwise uninhabitable territories. As if steam had not already made a sufficient mark on society, it also ended up in the average household kitchen where it is used to pressure cookfoods at a much faster and more economical manner. Pressure canners are being used to not only save money, but time and provide better health with more nutritious foods.
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