أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ١_ w

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter 1_ W


water, expansion of
dilatation of l'eau

Water expansion. It is normal for a substance to expand (its density decrease) as the temperature increases. It is also natural for the density of a liquid substance to be less than the density of another solid. But neither statement is completely true for water. Graph A below shows how the density of a normal substance falls when the temperature is close to the melting (or melting) point. The graph (b) shows the state of the water.

The density of liquid water is at its peak at a temperature near 4°C and not at 0°C. The resulting two effects mean that the ice floats on the surface of the water and that the temperature at the bottom of the pond in winter may be higher than the surface temperature. As a result, large volumes of water freeze slowly in cold weather. But life forms likely continue there. The expansion of water (instead of its expected contraction) when it cools between 4°C and 0°C is called “anomalous expansion of water.” (abnormal) expansion of water


water waves
On the phone and in the water

Water waves. Liquid surface waves are often mistakenly called transverse waves, but in fact they are a mixture of transverse and longitudinal behavior. In deep water, particles move in circles, and the radius of the circle decreases with increasing depth. The paths of particles in shallow water and below the surface layer are elliptical or longitudinal.
See also ripple tank.


watt
watt m

Watt. The practical unit of power. In electricity: W=IV, where:

W = power in watts.
I = current in amperes.
V = difference of cumin in qalt.


wave. wave
onde f

Wave. One type of radiation, the other type consists of particles. Wave generation and transmission involve vibration. In fact, any vibration can be shown in the form of a wave, so we plot the displacement with respect to time. The wave equation c=vd, the wave equation, determines the wavelength 8, the frequency 7 of the wave, and its speed in the medium. Most waves can be described as transverse or longitudinal. Transverse waves consist of oscillations whose direction tends to intersect with the transfer of energy.
As for longitudinal waves, their direction is the same as the direction of energy transfer. The drawings below show these two types in the case of a long spring.

All waves can exhibit the effects of absorption, reflection, refraction, diffraction, and interference, and polarization cannot occur except in the case of transverse waves.
See also electromagnetic waves, water waves, and sound


wave front
front m d'onde

Wave issued. A line or surface in which the wave has the same phase at all points. The particles are on a gradient and do the same thing at the same time.” A straight line (a vibrator in a ripple tank) generates waves in the form of a plane or a straight line, moving away from the source. The point source generates circular waves. The line perpendicular to the front of the wave shows the direction of travel.