What is Density
Explanation for Density
The density of a substance is the mass per unit volume The notation of density is Ď or the lower case of greek letter Rho Mathematically density is defined as mass divided by volume The normal unit for density is kg/m3
Measurement of Density Measurement in homogenous material is simple by measuring mass and volume Measurement of heterogeneous material is done in a complicated way using a integral formula Different techniques are used because some materials like sand, sugar, or snow contain voids Displacement method is also used together with total weight of liquid and the immersed solid
Changes in density Pressure increase will increase the density as it decreases the volume Temperature increase will decrease the density due to expansion on volume. Anomalous changes in density is observed in solid silicon in low temperature, where the volume increases as the temperature decreases in a particular window Several mathematical formulas are used to finding the density of solids at various temperature and pressure.
Units commonly used for density Kilograms per cubic meter (kg/m3) - Standard Unit Kilograms per liter (kg/L) grams per milliliter (g/mL) metric tons per cubic meter (t/m3)
Density facts The energy density of some materials can be used to create power, such as that found in uranium and thorium The energy density of uranium is 1,539,842,000 MJ/L, and this material is used for power plants, nuclear reactors, and industrial process heat The energy density of a lithium battery is 4.32 MJ/L and is used to power a portable flashlight
Density facts Density is important when constructing buildings, airplanes, and ships, because weight and weight distribution are important considerations for safety When measuring density it is important to know that increasing the temperature will decrease the volume The density of gas is difficult to measure because it can change when the pressure or temperature changes.
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