Search

...solid material within protoplanetary discs made predominantly of gas dates back to the Enlightenment, possibly starting with the idea that the planets of the Solar System formed out of a nebula surrounding the Sun, which featured in Kant’s Universal Natural History and Theory of the Heavens. Today, our understanding of protoplanetary discs stems from experimental...

...liquid, (s) signifies a solid and (g) is a gas. At high temperatures the equilibrium lies well to the left, so that in a hot solution carbon dioxide and hydrogen are stable. At lower temperatures, including those in seawater, the equilibrium position lies well to the right, but in a lifeless ocean an energy barrier would inhibit the reaction from moving in this direction....

...liquid to totally solid at a single temperature when it is cooled. Instead, different minerals crystallise over a range of temperatures (in fact over one or two hundred degrees Celsius). So, when the temperature of magma falls by a small amount, only a few mineral crystals will form (Figure 3b). On further cooling these crystals grow larger, and new minerals also start to...

...liquid chromatography (HPLC) is one method which is often used to analyse sugars. This type of analysis usually relies upon the attachment of radiation absorbing chemical labels to the sugars cleaved from the surface of proteins. This allows different structures to be separated and provides information about the different types of glycans in the mixture. Analytical...

...solid waste disposal methods, the UK government has now created a hierarchy of waste and local management strategies. The 12 video tracks in this album offer an in depth look at each of these processes, concentrating on waste collection, recycling, composting, energy recovery and landfill. This material forms part of T308 Environmental Monitoring, Modelling and Control......

...solid material with drill that rotates as it is fed into a stationary workpiece. Most common drilling machines are shown, but there are others such as deep hole, multispindle and gang drilling machines. Drilling machines can also be used for other operations such as centre drilling, reaming, boring and spot-facing. Cutting speeds vary from 150 to 10,000 m min-1, but slow...

...solids, liquids or gases, so the letter s, l or g is placed in brackets after each substance. So, since the coal is a solid, and the oxygen and carbon dioxide are gases, the complete version of reaction 1.1 would be: C(s) + O2(g) → CO2(g) Equation label: (2) Now consider what happens when natural gas, methane CH4, is burnt in a similar way. This time the products...