Sunday, January 31, 2010

Index.of Adult And Magazine Calculate The Mass Of Fine Particles Inhaled By An Adult Each Year.?

Calculate the mass of fine particles inhaled by an adult each year.? - index.of adult and magazine

Assuming he / she breathes approximately 350L of air per hour and the average of the PM2.5 air is about 10 mg / m 3 ^ Assuming that each of these particles have a diameter of about 1 micron and the particle density is about 0.5g/mL, the calculation of the annual burden of this particle.

Note: The surface of a spherical particle is equal 4Πr ^ 2, where r is the radius.

1 comment:

schmiso said...

The total volume of air per year
V_air = 0.350 m ³ / h 24 h / d • 365d
= 3066m ³

The total mass of solids inhalation
= C_solid m_solid · V_air
= 10 micrograms / m³ · 3066m ³
= 0.03066g

The volume of a particle
V_P = (4 / 3) π · r_p ³ ·
Bulk
Ρ = M_P _p _p · V_P = ρ * (4 / 3) π · r_p ³ ·
and its surface
S_p = 4 π ² · r_p ·
So its surface. This means that the area per unit mass:
= S_P s_p / M_P
= 3 / (ρ _p · rp)
= 3 / (· 0.5g/mL 1 micrometer) = 3 / (5 × 10 ^ 5 g / m³ · 1 × 10 ^-6m)
= 6 m² / g

The specific surface area of the entire solid is the same as for a single particle. Therefore
S_solid = s_solid · m_solid = s_p · m_solid
= 6 m² / g ⋅ 0.03066g
= 0.18396m ²

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