Lithium be cut with a knife. When cut, it possesses a silvery-white color that quickly changes to gray as it oxidizes to lithium oxide. While it has one of the lowest melting points among all metals (180 °C), it has the highest melting and boiling points of the alkali metals. Lithium has a very low density (0.534 g/cm), comparable with pine wood. It is the least dense of all elements that are solids at room temperature; the next lightest solid element (potassium, at 0.862 g/cm) is more than 60% denser. Furthermore, apart from helium and hydrogen, it is less dense than
Conditions of Fitness but this decision was challenged by judicial review. After a protracted study, the PCO again found that the turning circle was essential to maintain mobility. The current conditions have been applicable since 1 January 2007. The conditions require that all vehicles manufactured for use as licensed taxi cabs in London must be inspected for compliance with the standard before use. They regulate compliance with general UK and European vehicle standards and with specific design requirements including access to the vehicle, dimensions and layout, manoeuvrability, visibility and equipment. Amongst the main requirements are the need for separate passenger and driver compartments,