Science / Chemistry / Vacuum: A volume which contains no matter.

Vacuum Degassed Bearings

Technology / Motors / Vacuum Degassed Bearings: Vacuum degassing is a process used in the purifying of steel for ball bearings assuring a very dense and consistent bearing surface. This results in a longer lasting superior bearing. All Reliance bal MORE

Vacuum-Filter Method

Life Style / Coffee / Vacuum-Filter Method: A brewing method that differs from other filter methods in that the brewing water is drawn through the ground coffee by means of a partial vacuum. MORE

Vacuum Easel

Entertainment / Photography / Vacuum Easel: Is a compact printing frame which ensures firm contact between the film and paper by excluding air between the surfaces. Some types are used to hold the paper flat on the enlarger baseboard when enlar MORE

Vacuum Back

Entertainment / Photography / Vacuum Back: Is a camera back with a perforated plate through which air is drawn by a pump. A sheet of film is therefore sucked flat against the plate and held firmly during exposure. Used for special large format MORE

Zirconium (Zr)

Science / Periodic Table of Elements / Zirconium (Zr): Atomic number: 40, Atomic mass: 91.22 g.mol -1, Electronegativity: 1.2, Density: 6.49 at 20°C, Melting point: 1852 °C, Boiling point: 4400 °C, Vanderwaals radius: 0.160 nm, Ionic radius: 0.0 MORE

Strontium (Sr)

Science / Periodic Table of Elements / Strontium (Sr): Atomic number: 38, Atomic mass: 87.62 g.mol -1, Electronegativity: 1.0, Density: 2.6 at 20°C, Melting point: 769 °C, Boiling point: 1384 °C, Vanderwaals radius: 0.215 nm, Ionic radius: 0.113 MORE