1. Refer to the table below. Find the atmospheric pressure at 2120 m. Atmospheric Pressure (kPa) Air Density (kg/m) Altitude (m) 0 (sea level) 101.325 1.225 500 95.46 1.167 1000 89.87 1.112 1500 84.55 1.058 1.006 0.957 2000 79.50 2500 74.70 3000 70.11 0.909 3500 65.87 0.863 4000 4500 61.66 0.819 57.75 0.777

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.