Calculate weight using specific gravity and volume

The specific gravity of a substance is the ratio of the density of the substance, generally at a standard temperature of 20 degrees C 68 degrees Fto the density of water at a temperature of 4 degrees C Density is temperature dependent, so temperatures are usually specified when referring to density.

The reason why the density of the substance being compared to water is at 20 degrees C is because this is a convenient room temperature for handling the substance.

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The reason why water density is determined at 4 degrees C is because this is the temperature at which water reaches its maximum density. Since specific gravity is a ratio that compares the same type of units, specific gravity has no units associated with it, i. It is widely used in industry to determine the concentrations of solutions such as acids, brines, and sugar solutions syrups, juices, and beverage bases.

The specific density and therefore specific gravity of a substance can be determined using various tools. One way to determine specific gravity is to use a digital refractometer to measure the refractive index which is converted using a chart, to specific gravity.

Another method to determine specific gravity is to use a hydrometer. The hydrometer has a scale which is read while "floating" the instrument in the liquid. A digital density meter or oscillating U-tube meter is also often used in laboratories to determine specific gravity.

To determine the volume of a liquid using specific gravity:. Obtain the specific gravity of the liquid using a refractometer, digital density meter, hydrometer, or a reference chart. Determine the mass of the substance weigh it using a gram scale or assign a fictitious amount that is convenient such as grams. Assign the values in the formula and solve for V volume. How To Do Things.

Copyright Howtodothings. By Niko Hammond. Share this article! Twitter Facebook Stumble.Density is defined as mass per unit volume. The Imperial U. Note that there is a difference between pound-force lb f and pound-mass lb m. Slugs can be multiplied with On atomic level - particles are packed tighter inside a substance with higher density.

Density is a physical property - constant at a given temperature and pressure - and may be helpful for identification of substances.

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Below on this page: Specific gravity relative densitySpecific gravity for gasesSpecific weightCalculation examples. Specific Gravity Relative Density - SG - is a dimensionless unit defined as the ratio of the density of a substance to the density of water - at a specified temperature and can be expressed as. Water is normally also used as reference when calculating the specific gravity for solids.

See also Thermophysical Properties of Water - Density, Freezing temperature, Boiling temperature, Latent heat of melting, Latent heat of evaporation, Critical temperature Specific Gravity of gases is normally calculated with reference to air - and defined as the ratio of the density of the gas to the density of the air - at a specified temperature and pressure.

Density, Specific Volume, & Specific Weight

Molecular weights can be used to calculate Specific Gravity if the densities of the gas and the air are evaluated at the same pressure and temperature. See also Thermophysical Properties of Air - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusicity, Specific Weight is defined as weight per unit volume.

Weight is a force. A golf ball has a diameter of 42 mm and a mass of 45 g. The volume of the golf ball can be calculated as. The liquid may be ethyl alcohol! The mass of 0. This may not be clear in the description of products. Always double check values with other sources before important calculations.

Back to top.The temperature and pressure of both the material and water need to be the same as these factors influence the density and hence the specific gravity. Specific gravity is unique to every material and has a very wide range of application. In more general terms specific gravity is the ratio of the density of a material to that of any standard substance, although usually this is water at 4 degrees Celsius or By definition, water has a density of 1 kg per litre at this temperature.

The specific gravities of gases usually are compared to dry air which generally has a density of 1. The specific gravity of all other materials is compared to water as a fraction heavier lighter or heavier density.

The reference density of water at 4 o C 39 o F is used as the reference as these are the conditions of maximum density. There is a wide range of instruments designed to measure the specific gravity of a material. The hydrometer can be used to measure the specific gravity of any liquid.

The device is designed to float freely at the liquid surface with a protruding stem giving a reading corresponding to the specific gravity of the liquid. Other instruments to measure specific gravity are the Pycnometer, and digital density meters based on oscillating U-tubes. Specific Gravity has a wide range of applications including: Pharmaceuticals: The specific gravity is used to find out the purity of a drug since each of the constituents has a distinct specific gravity.

Determining the additives used in a base material: Specific gravity is used to find out the amount of additives used in a base material which might affect the performance and stability of the base material.

Urine Specific Gravity: The Urine Specific gravity USG is measured and used mostly in veterinary sciences to understand whether water is excreted or conserved in an appropriate fashion. Conversely the weight can be calculated if the volume is known. Other applications of specific gravity include fluid mechanics, buoyancy and the brewing industry. Bookmark this page in your browser using Ctrl and d or using one of these services: opens in new window Delicious Digg Facebook Reddit What are these?A frequent question arriving in my email mailbox is " how can I convert a volume to a weight? Questions also arrive from people who are trying to measure out cooking ingredients and need to convert from cups to grams or cups to tablespoons these links take you to my converters - set up to assist you.

The problem with this type of conversion is that it isn't as simple as it sounds. A metric ton is a unit of weight and liter is a unit of volume. Equally, the cup is a unit of volume and the gram a unit of weight. To complete a calculation such as this, you therefore have to factor in the density of the substance that you are trying to convert and include that in the formula calculation. The reason for this is obvious - a cup of feathers will weigh less than a cup of crude oil.

So, the substance is important for an accurate conversion. For those people looking for the formula for converting volume to weight, and vice-versa, it looks like this adapted from answers. If you are dealing with other units, say pounds, as a unit of weight, 'then 1 kg corresponds to 2. Similarly 1 lb corresponds to Physics, 5th ed, Addison Wesley, Before you can go any further with your calculation, you need to find out the density of the substance that you are trying to convert.

You should be aware that densities vary based upon temperature, where liquids are concerned. To help you out with your conversion, I have developed a weight to volume converter. On the converter page, I have included a list of substances and density approximations for some common liquids, materials, metals and woods.

This amount of the substance will weigh less on the Moon than it does on the Earth, and be 'weightless' in deep space. Also Specific Gravity is a ratio relative to water. Plan active dates along with your hubby, such as bowling or perhaps golfing, instead of dinner plus a movie. When obtaining your kids from school, escape the car and greet them which has a hug instead of waiting from the car curbside. Answer Save.

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Specific Gravity To Weight. This Site Might Help You. RE: how do i calculate weight if i know Specific gravity and Volume?

How To Convert Volume To Weight

How do you think about the answers? You can sign in to vote the answer. The Duke of Snowdon Lv 5. The term you really need to use is 'Mass' rather than 'Weight'. Yes it is right Weight is equal to specific gravity times volume thats the formula. However, lbs is a measure of weight, not mass. Density is defined as the "Mass per unit volume of a material" Specific Weight is the "Weight per unit volume of a material" Since you are looking for weight, you use specific weight - not density. Donna Lv 4.

Yes, just think about the units to check it's right. Show more answers 4.If you know the specific gravity of a solid or liquid, you can easily calculate its density, and then its weight. Specific gravity equals the density of the solid or liquid divided by the density of water at a specific temperature.

Once you know the density of that solid object or a specific liquid, you can calculate its mass per unit volume, and from that mass, you can get the weight. Once you know the mass, you have to convert to weight only if you're using the imperial measurement system.

Specific gravity is the density of a substance divided by the density of water. Once you know density, you know mass per unit volume, and from that you can determine the weight. In the imperial measurement system, you have to convert the mass in slugs to weight in pounds. Scientists use the concept of specific gravity to compare the density of a substance to that of water. To calculate specific gravity, you divide the density of the substance by the density of water at 4 degrees Celsius, since water achieves its maximum density at this temperature.

In other measurement systems, the density of water is not 1, so density and specific gravity are different numbers.

In the metric system, the units for mass and weight are the same: grams or kilograms. The imperial measurement system has different units for these quantities, though. This is because mass is a measure of the amount of matter an object contains while weight is a measure of the force of gravity on the object.

In the imperial system, the unit for mass is the slug and the unit for weight is the newton. The pound is also a unit of weight. One pound equals 4. Scientists tend not to distinguish between mass and weight on Earth, even though the imperial system preserves the distinction by using different units. If you know the specific gravity for a solid or liquid, you can find the density by multiplying the specific gravity by the density of water at 4 degrees Celsius.

In the imperial system, multiply by 1. Once you know density, you can calculate mass per unit volume. All you have to do is multiply that density by the volume of the solid or liquid to find the mass of the solid or liquid. In the metric system, the mass is equal to the weight, so no further conversion is necessary. Chris Deziel holds a Bachelor's degree in physics and a Master's degree in Humanities, He has taught science, math and English at the university level, both in his native Canada and in Japan.

He began writing online inoffering information in scientific, cultural and practical topics. His writing covers science, math and home improvement and design, as well as religion and the oriental healing arts.

About the Author. Copyright Leaf Group Ltd.The specific gravity stands for a dimensionless unit that defines the ratio of density of a substance to the density of water.

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In physics, the weight of the substance differs from its mass. The weight is the gravitational force that pulls any object to Earth. The specific weight corresponds to the weight per unit of the volume and can be calculated from the specific gravity. Knowing the specific weight, you can easily compute the weight of any amount volume of a substance. For example, the specific gravity of 0. Multiply the density by the acceleration of gravity 9.

In our example, the specific weight is x 9. Convert the volume to the cubic meter unit. If the volume is given in liters, then divide it by 1, If it is measured in gallons, then multiply the value by 0. For example, 5. Multiply the specific weight of the substance by the volume to calculate the weight.

In this example, the weight is Note that "newton" is a unit of force in physics. This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more, see our about us page: link below.

Updated April 24, About the Author. Photo Credits. Copyright Leaf Group Ltd.