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  2. Barbecue grill - Wikipedia

    en.wikipedia.org/wiki/Barbecue_grill

    The gas open-broiler design was adapted into the first portable gas grill in 1954 by Chicago Combustion Corporation as the Model AP. McGlaughlin's portable design was the first to feature the use of the 20-lb propane cylinders, which previously were exclusively used by plumbers as a fuel source. Types Electric Electric grill in use

  3. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    A total order on the natural numbers is defined by letting a ≤ b if and only if there exists another natural number c where a + c = b. This order is compatible with the arithmetical operations in the following sense: if a, b and c are natural numbers and a ≤ b, then a + c ≤ b + c and ac ≤ bc.

  4. Isobutane - Wikipedia

    en.wikipedia.org/wiki/Isobutane

    Isobutane, also known as i-butane, 2-methylpropane or methylpropane, is a chemical compound with molecular formula HC (CH 3) 3. It is an isomer of butane. Isobutane is a colorless, odorless gas. It is the simplest alkane with a tertiary carbon atom.

  5. Purchase order - Wikipedia

    en.wikipedia.org/wiki/Purchase_order

    A purchase order, often abbreviated to PO, is a commercial document issued by a buyer to a seller, indicating types, quantities, and agreed prices for products or services required. [1] It is used to control the purchasing of products and services from external suppliers. [2] Purchase orders can be an essential part of enterprise resource ...

  6. 1,3-Propanediol - Wikipedia

    en.wikipedia.org/wiki/1,3-Propanediol

    1,3-Propanediol is mainly produced by the hydration of acrolein. An alternative route involves the hydroformylation of ethylene oxide to form 3-hydroxypropionaldehyde. The aldehyde is subsequently hydrogenated to give 1,3-propanediol. Biotechnological routes are also known.

  7. Jean-Paul Marat - Wikipedia

    en.wikipedia.org/wiki/Jean-Paul_Marat

    Jean-Paul Marat ( UK: / ˈmærɑː /, US: / məˈrɑː /, [1] [2] French: [ʒɑ̃pɔl maʁa]; born Mara; 24 May 1743 – 13 July 1793) was a French political theorist, physician, and scientist. [3] A journalist and politician during the French Revolution, he was a vigorous defender of the sans-culottes, a radical voice, and published his views ...

  8. HAZMAT Class 2 Gases - Wikipedia

    en.wikipedia.org/wiki/HAZMAT_Class_2_Gases

    A propane tank car after a fire, the HAZMAT 1075 symbol can be seen in red as a warning of the danger posed by the gas. A gas is a substance which (a) at 50 °C (122 °F) has a vapor pressure greater than 300 kPa (43.51 PSI) or (b) is completely gaseous at 20 °C (68 °F) at a standard pressure of 101.3 kPa (14.69 PSI).

  9. History of the periodic table - Wikipedia

    en.wikipedia.org/wiki/History_of_the_periodic_table

    The history of the periodic table reflects over two centuries of growth in the understanding of the chemical and physical properties of the elements, with major contributions made by Antoine-Laurent de Lavoisier, Johann Wolfgang Döbereiner, John Newlands, Julius Lothar Meyer, Dmitri Mendeleev, Glenn T. Seaborg, and others.