Without going into a long derivation, the diameter (D) of a particle (in microns) can be estimated from a material with a known surface area (SA, in m2/gram) and density (p, in gram/cm3) using the equation D = 6 / (SA * p). As an example, an aluminum powder with a surace area equal to 0.5 m2/gram and a density of 2.7 gram/cm3 would be 4.44 microns (D = 6/(0.5*2.7) = 6/1.35 = 4.44) Assumptions: You are assuming that you have equi-sized, spherical particles (which is never the case, but allows for a good approximation).
Surface density is calculated by dividing the mass of an object or substance by its surface area. The formula is surface density (σ) = mass (m) / surface area (A). The standard unit for surface density is kilograms per square meter (kg/m^2).
A triangle is a flat area, therefore it has a surface area, not a volume. Density is unrelated to the problem; you would need some additional information to calculate the surface area.
You cannot These are different concepts. you need a volume and density to calculate mass, surface area provides neither (a cube and a sphere with the same surface area have different volumes and, had they been made of the same material, would have different masses).
To calculate the density of epiphytes per m2 of trunk, you would divide the number of epiphytes by the surface area of the trunk in square meters. This would give you the number of epiphytes per square meter of trunk. Density = Number of epiphytes / Surface area of trunk.
As a particle's size gets smaller, its surface area-to-mass ratio increases. This is because as the particle shrinks, its volume (and therefore mass) decreases faster than its surface area. This increased surface area-to-mass ratio can influence the particle's reactivity, solubility, and other properties.
You cannot use surface area to calculate density. Density is a calculation comparing TOTAL area and weight of an object. In short you must use the total volume of the object when calculating the density.
You need to:* Calculate the surface area * Calculate the volume * Divide the surface area by the volume
To find the density of a population, you divide the total population by the surface area. In this case, you would calculate the density by dividing 200,000 by 40,000 square kilometers. This results in a population density of 5 people per square kilometer. Thus, the density of the population is 5 individuals per square kilometer.
To calculate the pressure exerted on a surface, the force acting on the surface is divided by the surface area. Mathematically, pressure = force / area.
surface area divided by volume
Particle size can affect various reactions such as dissolution rate, surface area available for reaction, and diffusion rates. Smaller particle sizes increase the surface area, leading to faster reactions, while larger particle sizes can reduce the reaction rate due to lower surface area available for reaction.
To calculate the pressure exerted on a surface, the force normal to the surface is divided by the surface area. The formula for pressure is pressure = force / area.