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The Queen's Hamlet

The Queen’s Hamlet is a charming attraction in the park of the Palace of Versailles, built for Marie Antoinette in the 18th century. It consists of a group of rustic cottages and farm buildings, arranged around an artificial lake, that served as a place of leisure and education for the queen and her children. The hamlet was inspired by the naturalistic movement in art and architecture, and by the model farms that were popular among the French aristocracy at the time. The hamlet was also a way for Marie Antoinette to escape the formalities and pressures of the court life, and to enjoy a simpler and more intimate lifestyle. The hamlet was designed by Richard Mique and Hubert Robert, who also modified the landscape of the Petit Trianon, where the hamlet is located. The hamlet has three distinct areas: the reception area, where the queen entertained her guests in the boudoir, the billiard room, and the Queen’s House; the farm area, where the animals and crops were raised and the dair
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Liquid Oxygen

Liquid oxygen has a pale blue color and is strongly paramagnetic: it can be suspended between the poles of a powerful horseshoe magnet. Liquid oxygen has a density of 1.141 g/cm3 (1.141 kg/L or 1141 kg/m3), slightly denser than liquid water, and is cryogenic with a freezing point of 54.36 K (?218.79 °C; ?361.82 °F) and a boiling point of 90.19 K (?182.96 °C; ?297.33 °F) at 101.325 kPa (760 mmHg). Liquid oxygen has an expansion ratio of 1:861 under 1 standard atmosphere (100 kPa) and 20 °C (68 °F), and because of this, it is used in some commercial and military aircraft as a transportable source of breathing oxygen.

Because of its cryogenic nature, liquid oxygen can cause the materials it touches to become extremely brittle. Liquid oxygen is also a very powerful oxidizing agent: organic materials will burn rapidly and energetically in liquid oxygen. Further, if soaked in liquid oxygen, some materials such as coal briquettes, carbon black, etc., can detonate unpredictably from sources of ignition such as flames, sparks or impact from light blows. Petrochemicals, including asphalt, often exhibit this behavior.
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