أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٢_ f

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter 2_ F


fixed points (temperatures)
points mpl fixes

Fixed points (temperatures). Many properties of matter change with heat. When we measure these properties, we must mention the temperature when measuring. In fact, it is preferable to carry out the measurement at certain fixed temperatures: clearly defined and easily accessible. The two most common temperatures in school and university work are the ice point, 0°C, and the vapor point, 100°C. The first is the melting temperature of pure ice. The vapor point is the temperature of steam above boiling water at standard air pressure.

Fixed points are mainly used in scale
(Education) The thermometer ladder.


flip - flop
bascule f

Bistable shake. another name . bistable multivibrator for


flotation
flotaison f

float. A body floats in a liquid or gas if its weight is equal
The body with the upper thrust upthrust on it. See Archimedes principle. See the two illustrations below. Overhead push


fluid
fluide m

fluid. A liquid or gas, or rather a substance that can
It "liquefies" because its particles are not fixed in their positions like the particles of a solid. Viscosity measures resistance to flow, and it depends on temperature because the speed of particles depends on temperature. A viscous liquid, such as pitch or syrup, flows better when heated.

fluorescence
fluorescence m

Fluoridation. A common result of absorption. When a certain substance absorbs a certain radiation, the energy appears in the form of radiation of a lower frequency. Fluorescent paints, detergents, and tubes contain chemicals that absorb ultraviolet rays and release the energy in the form of visible light. Add such material
Chemicals are added to washing powders so that clothes appear bright white in daylight.
See discharge.

Glass tube coated with fluorinated powder
F-rays. B caused by discharge
Visible light
Fluorescent tubes (fluorescent tubes) convert most of the electrical energy into light compared to filament lamps (ordinary ball bulbs), and are about three times more effective (effective) than them.

flux pattern
diagramme m directionnel du flux

flow pattern. It is very similar to the flow of a magnetic field. In the advanced work, the flow pattern in the field of magnetism refers to the field lines (lines of force), as the density of the lines is determined to match the strength of the magnetic field.


focallength
distance f focale

Focal length. The distance between the pole of a lens or mirror and the focal point. The shorter the focal distance, the greater the power to bend light.
The focal point of a lens or mirror is where the arriving light passes closely and parallel to the axis, or appears to pass, after refraction or reflection.
f appears in the lens/mirror equation:

1/f = 1/u + 1/V

Where U is the distance between the electrode and the object and 7 is the distance between the electrode and the image. In this equation, we make f positive if the focal point is real, and negative if it is imaginary. Also called focal distance. See image.

Focal point
Focal length
Parallel rays


force(F)
force f

power . Force, any force, tends to change the momentum of an object, i.e. make it move more or less quickly and/or make it change direction. The unit of force is called the Newton, and it is the force that accelerates one kilogram over a distance of one meter per second.
Newton's laws of force link forces to their effects and lead to the saying F = ma. There are many different forces, but they are all attributed to three effects:

A) Gravity (Earth gravity). Attraction only, that is, the reason why the apple fell on Newton's head.
B) Magnetism. Attraction and repulsion between two magnetic poles.
C) Electricity. Attraction and repulsion between two electrical charges, positive + and negative -.

These forces operate at a distance, that is, across space. Many forces act when there is apparent contact between particles subject to the force. This is what happens with the forces of friction, weight, and pushing and pulling by pressure
And the tightening), and the one.