## Density

A density lab was just completed in one of my freshman Physical Science classes. A substance’s density is defined as its mass per unit volume. It’s how tightly the particles in a material are packed together, according to my students. The density of a material is high if the particles are close together. The following formula is used to measure density: Mass divided by volume equals density. The right unit for density is grams per cubic meter.
So, why did I give my students polystyrene cups to use in this experiment? Polystyrene has a lot of air pockets, which allows it to be a good insulator. As polystyrene is exposed to ocean depths and pressure increases, the material can shift. On their polystyrene cups, my students gathered preliminary data. They took measurements of their cup’s top diameter, bottom diameter, and height. Their cup’s density was also measured. When I return in January with their polystyrene cup samples, these measurements will be repeated. My students will be able to decide whether their polystyrene cups will be affected by exposure to ocean depths and pressure changes.

## Final temperature of ice and water mixture – how many

/plistarin/ Polystyrene (PS) is a synthetic aromatic hydrocarbon polymer made from the monomer styrene.

### Coffee cup calorimeter – calculate enthalpy change

(5) Polystyrene comes in two forms: strong and foamed. Polystyrene is a transparent, rough, and brittle material used for a variety of purposes. It is a low-cost resin in terms of unit weight. It has a low melting point and is a relatively weak barrier to oxygen and water vapour. [number six] Polystyrene is one of the most commonly produced plastics, with annual production numbers in the millions of tonnes. [nine] Polystyrene can be transparent by itself, but it can also be colored with colorants. Protective packaging (such as packing peanuts and jewel cases used to store optical disks such as CDs and sometimes DVDs), tubes, lids, bottles, trays, tumblers, disposable cutlery[6], and model making are only a few of the applications.
Polystyrene is a thermoplastic polymer that is solid (glassy) at room temperature but flows when heated above around 100 degrees Celsius, its glass transition temperature. When it cools, it returns to its original rigid state. Since it can be cast into molds with fine precision, this temperature behavior is used for extrusion (as in Styrofoam) as well as molding and vacuum forming.

### How to calculate buoyancy

The densities of various materials are described in the table below. Gaseous substances are described in red (at normal temperature and pressure, 20°C and 1 atmosphere); liquids are green, and solids are blue.
SPREADSHEET NUMBER NUMBER NUMBER NUMBER NUMBER N Create a spreadsheet with two input cells for a sphere’s mass and radius, and one measured cell for the sphere’s density. The density should be expressed in grams per cubic centimeter. Then, using your spreadsheet, measure the Earth’s density (mass is 5.98E24 kg and radius is 6378 km). Also, double-check your answer to question #8 using your spreadsheet.

### Convertir de cm3 a litros

They are both solid and remarkably good insulators (the Figure shows a brick backed by a virtually invisible aerogel). A MOVIE demonstrates that even after heating one side of a 6 mm aerogel blanket to 1000 degrees Celsius, the other side can still be reached. Aerogels may also be used to secure sensitive equipment such as hard drives by cushioning effects. Aerogels have the texture of styrofoam but the appearance of “frozen smoke.”
The words “heavy” and “soft” are often used interchangeably. When we say that an adult is heavier than an infant, we are referring to weight. When we suggest the styrofoam is thicker than an aerogel, though, we’re saying something else. While a small sample of styrofoam will obviously weigh less than a roomful of aerogel, styrofoam is heavier in the sense that a piece of the same size weighs more than a piece of balsa of the same size.
The density, or mass per unit volume, is what we’re really comparing. We may measure a cubic centimeter of each substance to decide its densities. If the styrofoam was 0.10 g and the aerogel was 0.001 g, the density of styrofoam would be 0.10 g cm–3 and the density of an aerogel would be 0.001 g cm–3. (A reciprocal is indicated by the negative exponent in the units cubic centimeters.) As a result, 1 cm–3 = 1/cm3, and our density units could be written as g/cm3 or g cm–3. The units are read as grams per cubic centimeter, with the per indicating division.) We commonly abbreviate “cm3” as “cc,” and 1 cm3 equals exactly 1 mL by definition.