The pressure of a fixed mass and fixed volume of a gas is directly proportional to the gas’s temperature.
This relationship is known as the Gay-Lussac’s Law and a pressure cooker is an example of the law in practice. Cooking under pressure creates the possibility of cooking with high temperature liquids because the boiling point of a liquid increases as its pressure increases. High pressure and high heat can result in delectable dishes.
Cooking under pressure can be also dangerous because as liquids change phase into gases their volume expands greatly. For example, at atmospheric pressure the volume of steam is about 1700 times greater than the volume of water. To prevent pressure cookers from becoming bombs, relief devices (pop safety valves) are employed that are capable of relieving all of the steam the vessel is capable of producing.
America the Beautiful Pressure Cooker
The political pressure cooker is beginning to heat up. The power brokers and institutions that drive the nation have arrived unannounced on the doorsteps of America like a gaggle of unwanted, high maintenance relatives that demand hospitality for an unforeseeable time and that won’t take no for answer. Furthermore, they’ve announced that more relatives are on the way. Whatever plans America’s householders had, they’ve just gone out the window, with their household budgie and the relatives’ cat in hot pursuit.
People are justifiably angry with this incursion. Their budgie might not have been much, but it was “their budgie”, nurtured from birth into what it had become. Justifiably angry householders are trying to work out why the relatives arrived on their doorsteps and why they brought their fucking cat. Continue reading
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