EMF is basically a big picture. It's an updated version of WMF.
PCL is a printer control language (similar to Postscript) it was invented by HP.
XPS is the abbreviation of XML Paper Specification. It is a page description language which can describe a single page or a document containing multiple pages.
It means EXtraordinarily Powerful Sasquatch and extreme performance system
The staircase effect in X-ray photoelectron spectroscopy (XPS) is caused by the step-like energy levels in an XPS spectrum, which are due to the discrete energy levels at which electrons are ejected from different atomic orbitals. This effect can make it difficult to accurately determine the binding energies of elements in a sample, especially if there is overlap between different elements' energy levels.
The density of styrofoam is typically around 0.03 - 0.05 g/cm³, which is very low compared to many other materials. This low density is what makes styrofoam a popular choice for packaging and insulation materials.