Word Finder - density

definition

A measure of the mass of matter contained by a unit volume.

synonyms

• mass density

definition

The ratio of one quantity, representing something of interest, to another quantity representing space, area, or extent in which the thing of interest is distributed.

example

The number of particles per unit volume of a specified volume can be considered to be the particle density for the specified volume.

synonyms

• number density

definition

The probability that an outcome will fall into a given range, per unit of that range; the relative likelihood of possible values of a continuous random variable.

synonyms

• probability density

definition

Stupidity; denseness.

One half of the earth has therefore a greater density than the other.

One of the most remarkable of Airy's researches was his determination of the mean density of the earth.

The density of the population is 175 to the sq.

The density of helium has been determined by Ramsay and Travers as 1.98.

In these proportions the density of the alloy is less than the mean of its constituent metals.

The earth would intercept an amount of it proportional to the solid angle it subtends at the sun; that is to say, it would receive a deposit of meteoric matter about one-tenth of a millimetre, of density say 2, over its whole surface in the course of the year.

The passes across these ranges are comparatively low, but they are difficult because of the precipitous character of their Pacific slopes and the density of the vegetation on them.

Julius's phenomenon seems inseparable from grazing incidence, and hence any explanation it supplies depends upon his hypothetical tubular structure for layers of equal density.

The resistance of clay to percolation by water depends chiefly upon the density of the clay, while that density is rapidly reduced if the clay is permitted to absorb water.

Low density material allows greater radiation to reach the scintillation detector.

The computed density therefore does not correspond to a self-consistent atomic calculation.

Eleven out of 16 studies in postmenopausal women showed improvements in bone density with either exercise or exercise plus calcium or estrogen.

The singularity theorems imply the universe had an infinite density at some time in the past.

It is easy to calculate that this would be produced by an annual fall of matter equal to one nineteen millionth of the sun's mass, which would make an envelope eight metres thick, at the sun's mean density; this would be collected during the year from a spherical space extending beyond the orbit of Jupiter.

On the restoration of the pressure, the density will be again increased by the reduction of the water-filled interstices, and the percolation will be correspondingly checked.

Thus they not only penetrate all cavities in an exceedingly intrusive manner, but exert pressures in all directions, which, owing to the density of the asphalt, are more than 40 greater than would be produced by a corresponding depth of water.

It is obvious that the angles at the base of such a hypothetical dam must depend upon the relation between its density and that of the water.

These subjects are discussed in the articles Density; Thermometry; Calorimetry; Diffusion; Conduction Of Heat; and Condensation Of Gases.

The coma itself is very rarefied, having a density that is only about one ten thousandth of that of the Earth 's atmosphere.

Ardura 70D is a high density ripstop fabric using densely packed 70 denier yarns for strength and low weight.

This comparison verifies the steep rise of the gluon density at low x with a precision of @ 15-20 %.

Figure 2 Mean (±SD) relative change in scat density in each of the nine regions.

The density is 317 per sq.

This supposes the present density nearly uniform; if it is not uniform, any amount added to the former period is subtracted from the latter.

It can be shown, for example, that for masonry having a density of 3, water being 1, the figure of minimum section is a right-angled triangle, with the water against its vertical face; while for a greater density the water face must lean towards the water, and for a less density away from the water, so that the water may lie upon it.

As the density of the heaviest rocks is only 3, that of a masonry dam must be below 3, and in practice such works if well constructed vary from 2.2 to 2.6.

For a density of 2.5 the base would therefore be 44.7% of the height.

The late Sir Benjamin Baker, F.R.S., suggested that the stresses might be measured by experiments with elastic models, and among others, experiments were carried out by Messrs Wilson and Gore a with indiarubber models of plane sections of dams (including the foundations) who applied forces to represent the gravity and water pressures in such a manner that the virtual density of the rubber was increased many times without interfering with the proper ratio between gravity and water pressure, and by this means the strains produced were of sufficient magnitude to be easily measured.

The line of pressures as generally given for this dam with the reservoir full, on the hypothesis that the density of the masonry was a little over 2, is shown by long and short dots in fig.

Materials actu ally collected from the dam indicate that the mean density did not exceed I.

And the weight of air displaced depends upon the density of the air at the time of weighing, and therefore the barometer reading must be taken.

The retort carbon products* formed as a dense deposit on the crown of the retort by the action of the high temperature on the hydrocarbons is, however, carbon in a very pure form, and, on account of its density, is largely used for electrical purposes.

The population of Wisconsin in 1890 was 1,686,880 (exclusive of 6450 persons specially enumerated); in 1900 the total was 2,069,042 - an increase of 22.2% on the basis of the total at each enumeration; and in 1910 it reached a total of 2,333,860.2 The density of the population in 1910 was 42.2 to the square mile.

A temperature of 70, and a reversal of the current (of low density) between two cast iron electrodes every few minutes, are the best working conditions.

In 1826 and 1828, Whewell was engaged with Airy in conducting experiments in Dolcoath mine, Cornwall, in order to determine the density of the earth.

This is one of the most troublesome problems in astronomy because, owing to the ever varying density of the atmosphere, arising from differences of temperature, and owing to the impossibility of determining the temperature with entire precision at any other point than that occupied by the observer, the amount of refraction must always be more or less uncertain.

Not the slightest change in the direction of such a star when in this position has ever been detected, and it is certain that if any occurs it can be but a minute fraction of a second of arc. As an atmosphere equal to ours in density would produce a deviation of an important fraction of a degree, it may be said that the moon can have no atmosphere exceeding in density the b b l o o that of the earth.

As seen from the above table the density of the population is unequal in the various crown lands.

In the bestwatered districts agriculture is naturally of the greatest importance, except where the density of the forest renders the work of clearing too arduous.

Ice forms over fresh water if the temperature of the air has been for a sufficient time at or below the freezing-point; but not until the whole mass of water has been cooled down to its point of maximum density, so that the subsequent cooling of the surface can give rise to no convection currents, is freezing possible.

If unit mass of a solution contain m grammes of an active substance and if o be the density and p be the rotary power of the solution, the specific rotary power is defined by p/m8, and the molecular rotary power is obtained from this by multiplying by the hundredth part of the molecular mass.

Fresnel obtained his formulae by assuming that the optical difference of media is due to a change in the effective density of the ether, the elasticity being the same - an assumption inconsistent with his theory of double refraction - and was led to the result that the vibrations are perpendicular to the plane of polarization.

Franz Neumann and James MacCullagh, starting from the opposite assumption of constant density and different elasticities, arrived at the same formulae for the intensities of the reflected light polarized in the principal azimuths, but in this case the vibrations must be regarded as parallel to the plane of polarization.

At 300 metres its density is 1.253.

The play of brilliant colours and of ever-changing contrasts of light and shade on those rugged mountain-sides and on the surface of the sea itself might have been expected to appeal to the most prosaic. The surface of the sea is generally smooth (seldom, however, absolutely inert as the pilgrims represented it), but is frequently raised by the north winds into waves, which, owing to the weight and density of the water, are often of great force.

At the beginning of 1905, the state contained 181,roo people, giving a density of 6.9 persons per square mile.

The density of population for the whole government is estimated as 3.7 or 4 per sq.

The density of population being calculated at about 2.7 to 3 per sq.

This principle is capable of very wide extension, the blast furnace being mainly limited in height by the strength the column of materials or "burden" has to resist crushing, under the weight due to the head adopted, and the power of the blowing engine to supply blast of sufficient density to overcome the resistance of the closely packed materials to the free passage of the spent gases.

When melted the products separate on the bed (which is made of closely packed sand or other infusible substances), according to their density; the lighter earthy matters forming an upper layer of slag are drawn out by the slag hole K at the flue end into an iron wagon or bogie, while the metal subsides to the bottom of the bed, and at the termination of the operation is run out by the tap hole L into moulds or granulated into water.