relative density Material density and the density of reference materials under the conditions specified in the respective ratio. Symbol d, dimensionless quantity. General, the relative density of gas is only used as a reference density of the dry air under standard conditions of density, as 1.2930kg/m3. For liquids and solids, generally do not use the relative density. When 1g/cm3 as a reference density (the density of water at 4 ℃), the last known weight (specific gravity). Reference: Density is mass per unit volume of material, which is based on the quality of its materials, the ratio of volume to be measured. That density = mass / volume, indicating that: it has units Now look at the density of the basic terms of the relative density, which is mainly used in gemology. Material density and the ratio of the density of standard material, known as the relative density in most cases, the standard substance is water, it can be understood, the same volume of material quality and the quality of the same volume of water ratio. Hydrostatic weighing the relative density can be made to measure, the more commonly used in gem identification is the proportion of fluid method. However, the proportion of liquid should be used with caution, because the proportion of liquid toxic.
Translated by Google
No. 2
relative density Material density and the density of reference materials under the conditions specified in the respective ratio. Symbol d, dimensionless quantity. General, the relative density of gas is only used as a reference density at standard state (0 ℃ and 101.325kPa) under dry air density, as 1.2930kg/m3. For liquids and solids, generally do not use the relative density. When 1g/cm3 as a reference density (the density of water at 4 ℃), the last known weight (specific gravity). The relative density of the water is generally the time at 4 degrees to use the density as 1, and the other is saying a substance divided by the density obtained. The relative density but no unit only, with the actual density values are the same. Easy to use, such calculations can also be used. According to a considerable density of certain substances can be speculated that the characteristics of a fire, take appropriate fire safety measures. Such as the relative density <1 of flammable and combustible liquids fire fighting water should not be, because it will float on the water, not only to save the immortal, but with the bulk water, expanding the losses. Therefore, you should use foam, dry powder. Another example is the relative density <1 of flammable gases and vapors, easy to spread and form an explosive mixture of air, easily along the ground, ditches long-distance movement in case of fire, burning will happen back. In determining the workshop, warehouse vent position, the gas is lighter than air, vents should be located in space at the top; gas is heavier than air, vents should be located in the space below. Reference: Density is mass per unit volume of material, which is based on the quality of its materials, the ratio of volume to be measured. That density = mass / volume, indicating that: it has units Now look at the density of the basic terms of the relative density, which is mainly used in gemology. Material density and the ratio of the density of standard material, known as the relative density in most cases, the standard substance is water, it can be understood, the same volume of material quality and the quality of the same volume of water ratio. Hydrostatic weighing the relative density can be made to measure, the more commonly used in gem identification is the proportion of fluid method. However, the proportion of liquid should be used with caution, because the proportion of liquid toxic. The density of a substance and the ratio of the density of water is called the relative density of this material Determine the relative density of the liquid [Experimental principles] The density of water is about 1000 kg / m 3, while the object relative to the density of water is defined as The relative density of the object object = mass / volume of water with the quality of [Equipment] experimental A bottle; a balance; liquid (eg with methanol, ethanol); water; cloth or absorbent paper. [Experimental procedure] (1) with the balance to weigh out the dry empty bottle of quality, and denoted by m1 (g). (2) test the relative density bottle filled with liquid, stuffed with cork; with a dry cloth or absorbent paper surface of the bottle; and then saying the quality will be recorded as m2 (g). (3) the liquid poured inside the bottle, and wash with water. (4) filled with water in the bottles, stuffed with dry cork and the bottle surface; call quality, denoted by m3 (g). (5) using the following formula. Measured the density of liquid water as compared to ρ relative = (m2-m1) / (m3-m1) Graduated cylinder or balance measurements with the results compared with the measured density of the liquid out of may be different, the main reason for this difference is similar to that of water density is 1000 kg / m 3 caused. 11.2.2 Determination of the relative density of beans [Experimental principles] The density of water is about 1000 kg / m 3, while the object relative to the density of water is defined as The relative density of the object object = mass / volume of water with the quality of [Equipment] experimental A bottle; a balance; several beans; water; cloth or absorbent paper. [Experimental procedure] (1) with the balance to weigh out the dry empty bottle of quality, and denoted by m1 (g). (2) pour beans into the bottle, to bottle height of about 1 / 3; saying the quality will be recorded as m2 (g). (3) bottle filled with water and shake gently to make bubbles floating to the bottle, stuffed with cork. With a dry cloth or absorbent paper surface of the bottle, and then saying the quality will be recorded as m3 (g). Note: In the above experimental procedures, in order to avoid the beans due to water absorption and expansion, it is best to use cold water, and operation time as short as possible. (4) bottle of water and the beans will be poured out, and clean the bottle, then filled with water, stuffed with cork and dry the surface of the bottle, saying the quality, denoted by m4 (g). (5) in accordance with the following formula to calculate the density of objects relative to the water ρ relative = (m2-m1) / [(m4-m1) - (m3-m2)] Through this experiment we already know, the quality bean = (m2-m1) (g), a bottle of water (excluding bottles) Quality = (m4-m1) (g), and about 2 / 3 bottles of water (bottles rest with beans) quality = (m3-m2) (g), so, with the beans with the same volume of water quality = (m4-m1) - (m3-m2) (g), so the beans compared to the density of water determined by the above formula.
Translated by Google
English Expression
: Relative density
Related Phrases
science
chemical industry
Containing Phrases
inspect Relative density
truly Relative density
crude Relative density
antithesis densitometry
Bitumen Compactness And Relative density Trial
bitumen Mix Abstract most Relative density effector