PE Civil Construction Practice Exam

The density of water in metric units is indeed 1000 kg/m³. This value represents the mass of water occupying a volume of one cubic meter. Density is defined as mass per unit volume, and for water, this standardized figure is commonly used in various scientific and engineering calculations. In many applications, especially in civil engineering and related fields, knowing the density of water is crucial for calculations involving buoyancy, fluid pressure, and hydraulic structures. The value of 1000 kg/m³ is representative of pure water at a temperature of around 4 degrees Celsius, where it reaches its maximum density. The other options pertain to different units or physical properties. For example, 62.4 lb/ft³ is the density of water expressed in imperial units, while 9.8 N/m³ relates to the weight density of water due to gravitational effects. Lastly, 14.7 psi is a measurement of pressure and does not pertain to density at all. Thus, the choice indicating a metric density of 1000 kg/m³ accurately reflects established standards in physics and engineering.