SU540195A1

SU540195A1 - Method for determining the specific gravity of solids and liquids

Info

Publication number: SU540195A1
Application number: SU1779630A
Authority: SU
Inventors: Аркадий Эдуардович Гликин; Алексей Прокопьевич Касаткин
Original assignee: Ленинградский Ордена Ленина И Ордена Трудового Красного Знамени Государственный Университет Им. Жданова
Priority date: 1972-05-03
Filing date: 1972-05-03
Publication date: 1976-12-25

Description

(54) СПОСОБ ОПРЕДЕЛЕНИЯ УДЕЛЬНОГО ВЕСА ТВЕРДЫХ И ЖИДКИХ ТЕЛ(54) METHOD FOR DETERMINING A SPECIFIC WEIGHT OF SOLID AND LIQUID BODIES

действующих на поплавок без образца и с образцом, при одинаковых давлени х;acting on the float without a sample and with a sample at the same pressure;

Л Г - разность результирующих сил, действующих на поплавок без образца, при двух значени х внешнего давлени Р иL G is the difference of the resultant forces acting on a float without a sample, with two values of external pressure P and

Р а R a

разность результирующих сил, the difference between the resulting forces

действующих на поплавок, содержащий образец и сжимаемую среду, при тех жеacting on the float containing the sample and compressible medium, with the same

РдRD

двух значени х давлени 1two pressure values 1

и and

и - изотермическа сжимаемостьand isothermal compressibility

газа;gas;

Claims

V is the sample volume. Invention Formula

A method for determining the specific gravity of solid and liquid bodies, based on measuring their weight by volume in a sealed container of variable volume filled with a gas with known compressibility, characterized in that, in order to improve measurement accuracy, the sealed container with and without a sample is immersed in known specific gravity and measure the effective gravity of the sealed

capacity at two fixed values of external hydrostatic pressure, and the desired value is found by the formula

dR

where Guf- sample weight:

U is the isothermal compressibility of gas;

dr - pressure difference;

dr is the difference of the resultant forces acting on the float with and without a sample at the same pressure;

the difference of the resulting forces acting on the float without a sample, with

P two values of external pressure P and

the difference in the resultant forces acting on the float containing the sample and the compressible medium at the same pressure values;

d is the specific weight of the sample;

V is the sample volume;

O is the specific gravity of the liquid in which the container is immersed.