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From definition of pressure have P=F/A (in reality for a ball we are talking about infinitesimal areas, but the general definition is sufficient at this level). Assume that the area of the surface under c...

The ‘external environment’ is the combination of factors that occur outside of the business. These include: political, economical, social, technological, legal and environmental factors. In terms of the e...

A negative enthalpy change represents an exothermic change where energy is released from the reaction, a positive enthalpy change represents an endothermic reaction where energy is taken in from the surro...

The first is in a closed economy, where there are just households and firms present and thus no exchange between the two in terms of spending and transfer of goods and services. The second is in an open e...

• Thin alveolar walls for O2 and CO2 to travel through - To travel across the membrane, gases have to be dissolved, so the alveolar walls are moist - Large surface area to volume ratio allows for maxi...