who invented pressure cooker?
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DENIS PAPIS \nDenis Papin was famous in 1691 for the pressure-cooker ("digester") invention.\nHe had also invented the safety-valve to avoid the blast.\nIf the pressure on water differs from that of sea-level atmosphere, the boiling point is affected.\nAn increase of pressure outside the water raise the boiling point. The pressure cookers operate in this principle. Their steam-tight lids permit food to be boiled or steamed at temperatures higher than those can be obtained in an open vessel.\nThis is the reason of the more rapid food cooking
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He's an inventor from the 1870's.  He invented a process for preparing coconut for domestic use, biscuit cutters, and a process of refining coconut oil.\n\nCheck out these websites.  I hope this helps.  Good luck to your son.
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The first computer hard disk used. The hovercraft invented by Christopher Cockerell. As a result of the joint research of Sherman and Smith, the Scotchgard™ Protector was launched in the marketplace. Secretary Bette Nesmith Graham invented "Mistake Out" later renamed, Liquid Paper. The first commercial videotape recorder is introduced. The device is intended for industrial applications, and it quickly revolutionizes the way television programming is produced. Norman Bier invents plastic contact lenses
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http://inventors.about.com/library/inventors/blpeanutbutter.htm
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Hero's Engine\nChinese Traction Engine circa 1600\nTurned into a useful tool by James Watt - no he didn't invent it.
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Something he invented.
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Lewis Waterman in 1884\nhttp://inventors.about.com/library/weekly/aa100897.htm
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in pressure cookers water is heated under  pressure due to witch boiling point of water increases.& it remains in liquid form over 100 degrees also. (over 100 degrees water changes its phase from liquid to gas).\nso the water in pressure cookers can give more heat compared to water in other vessals used for cooking.\n& u can cook faster
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Thomas Crapper invented the toilet.  o.0
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Alan Curtis Kay is considered as the Father of Personal Computing.\n\nFor more info: http://www.sdsuniverse.info/story.asp?id=27397
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Thomas A. Edison\n\nHow do you give me 12 pts?
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Microwaves themselves were not invented; they are a kind of electromagnetic radiation, like light or radio waves. Percy Spencer invented the microwave oven while working for Raytheon.
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the one who discovered/ invented it had the last name of fahrenheit.
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Briton B. M. Wright invented a new. pneumatic nebulizer \n\n1958
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1989 First multifunctional measuring device with a softkey user interface, insertable program and memory cards, and insertable hardware modules to allow configuration of the hardware as required\n\n\nrefer:\n\nhttp://www.pruftechnik.com/pt/history.htm
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His kids are following in his footsteps -- inventing new cooking devices.  You might e-mail them and ask.  Here is their company's website:\n\nhttp://www.smokaroma.com/default.asp
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Cooking food with microwaves was discovered by Percy Spencer while building magnetrons for radar sets at Raytheon. He was working on an active radar set when he noticed a strange sensation, and saw that a chocolate bar he had in his pocket had melted.\n\nIt was patented in 1946