DENSITY OF GOLD HOW TO

For the cast iron object (a), the mass was 209.47 g in air and 180.13 g in water, giving 7.13 g/cm 3. For example, for the aluminum object (b) the mass was found to be 110.18 g in air and 69.45 g in water, giving a density of 2.70 g/cm 3. In each sample, the density was determined from the above formula. Yellow cartridge brass (70% copper and 30% zinc, 8.45 g/cm 3).Reddish copper alloy (possibly 85% copper and 15% zinc, 8.23 g/cm 3).The measured densities of the metal samples in Figure 1 are provided below. Metal objects used to demonstrate the procedure. В© Government of Canada, Canadian Conservation Institute. If the object is weighed in air to determine its actual mass and weighed in a liquid to determine its (apparent) mass in the liquid, then the density of the object is given by: The density ПЃ of an object or a material is defined as the mass m divided by the volume V in symbols, ПЃ = m/V. Repeat steps 4вЂ“9 with the remaining objects.Compare the calculated density with the known densities of metals and alloys, using the table given below or the more comprehensive lists available in the references.Calculate the density using the equation below.

Make sure there are no bubbles trapped under the object or in voids within the object. Place a support under the beaker to hold it at the correct height.

Lift the beaker until the object is completely immersed.

Fill the beaker with water and place it under the balance.

Wear gloves when handling metal objects, especially those suspected of containing lead.

Hang an object on the hook beneath the balance using nylon thread or equivalent and weigh it in air.

Attach a wire hook to the internal hook and then tare the balance (set it to zero).

Place the balance on a support with a hole that allows access to the internal hook.

Remove the cover from the underside of the balance to expose the hook inside.

Procedure to determine density with below balance weighing capability

Optional: Clamps to attach the balance support to the edge of a counter.

fishing line or an equivalent lightweight material) for suspending the objects under the balance

Supports to hold the beakers at the correct height underneath the balance.

Beakers large enough so that the objects can be totally immersed without the liquid overflowing.

Support stand or platform to hold the balance so objects can be hung underneath it from the hook.

Metal wire to attach to hook inside balance (a bent paperclip works well).

DENSITY OF GOLD HOW TO

Balance with below balance weighing capability (that is, can weigh objects suspended underneath it) and that can measure to a resolution of at least 0.01 grams (see the section Balance without below balance weighing capability for how to adapt the procedure for weighing below the balance).

Small metal objects that can be immersed in water.

Procedure: determining metal density Equipment and materials required to determine density Then the density of unknown metals can be determined. The first step is to carry out the procedure on one or more metal objects of known composition, either a pure metal or an alloy, to gain experience using the method and to confirm that it is being used correctly. This Note describes the procedure and the required materials for determining the density of a metal object. Once the density is determined, it can be compared to densities of known materials to help narrow down what the object might be made of. The method works for complicated shapes, even objects with holes through them, as long as the liquid can penetrate and fill the holes. With the right balance and the right size container, this method can be used on a variety of objects: large or small, metal or non-metal. The density of the object can be calculated from the two weight measurements and the density of the liquid. Water is the most convenient liquid to use, but if an object cannot be immersed in water, then organic solvents such as ethanol or acetone can be used. A simple way to determine the density of a metal object is to weigh it in air and then weigh it again when it is immersed in a liquid, as explained in the section The science behind density measurements. The density is characteristic of the material that the object is made of, and its value can help to identify the material.Д®xcept for objects with simple shapes, it is difficult to determine the volume directly. The density of an object is the objectвЂ™s mass divided by its volume.

The science behind density measurements.

Density of gold