أكاديميا - كولنز - معاجم الجيب العلمية - الكيمياء - انكليزي - فرنسي - عربي الحرف ٢_ v

Academia - Collins - Pocket Scientific Dictionaries - Chemistry - English - French - Arabic Letter 2_ V


vitamin
vitamin f

Vitamin. Vitamins are chemicals that are important for the regular functioning of the body. Vitamins tend to be complex organic molecules that cannot be made by the body but must be eaten, such as dairy products that contain vitamin A or fruits that contain vitamin C.


volatile
volatile

pilot. The volatile substance easily turns into vapor. These substances either have boiling points close to room temperature, such as ether or propanone, or they are sublime solids, such as carbon dioxide. Volatile and flammable liquids (see flame) are extremely dangerous due to the possibility of explosions. Necessary precautions must be taken when storing and handling it.


volume
volume m

size. The volume of a substance is the amount of space it occupies. Solids and liquids have fixed, specific volumes, while gases have the volume of the container they contain. The larger the vessel, the lower the gas pressure. The volume of a gas can be easily changed by compressing it, but changing the volumes of solids and liquids is much more difficult. Hydraulic car brakes depend on this property of the fluid. Volumes are measured in cubic centimeters (cm3).


volumetric analysis
Analyze volume

Volumetric analysis. A quantitative method of analysis that uses precisely measured volumes of solutions. See titration, pipette, and burette.


vulcanization
vulcanization f

Accent. In this process, sulfur is added to the rubber to make it harder.