Search results
Results from the WOW.Com Content Network
Density (volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ...
The unusual density curve and lower density of ice than of water is essential for much of the life on earth—if water were most dense at the freezing point, then in winter the cooling at the surface would lead to convective mixing. Once 0 °C are reached, the water body would freeze from the bottom up, and all life in it would be killed. [36]
A density meter (densimeter) is a device which measures the density of an object or material. Density is usually abbreviated as either ρ {\displaystyle \rho } or D {\displaystyle D} . Typically, density either has the units of k g / m 3 {\displaystyle kg/m^{3}} or l b / f t 3 {\displaystyle lb/ft^{3}} .
The density functional formalism of quantum mechanics requires knowledge of the electron density only, i.e., it formally does not require knowledge of the wavefunction. Given an electron density ρ ( r ) {\displaystyle \rho (\mathbf {r} )} , the exact N-electron kinetic energy functional is unknown; however, for the specific case of a 1 ...
Electron density or electronic density is the measure of the probability of an electron being present at an infinitesimal element of space surrounding any given point. It is a scalar quantity depending upon three spatial variables and is typically denoted as either ρ ( r ) {\displaystyle \rho ({\textbf {r}})} or n ( r ) {\displaystyle n ...
Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. It was the first grade of polyethylene , produced in 1933 by John C. Swallow and M.W Perrin who were working for Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization . [ 1 ]
Vicat softening point at 50 N: 145–150 °C (293–302 °F) [1] Upper working temperature: 115–130 °C (239–266 °F) Lower working temperature: −40 °C (−40 °F) [2] ...
Given the high population density of the state, Bihar is significantly behind in the number of healthcare professionals that should be employed. [124] [123] Despite these shortcomings, Bihar has shown gradual signs of improvement for female health workers, [116] the overall death rate, and infant, neo-natal, child and maternal mortality rates ...