spring

Device, usually a metal coil, that returns to its original shape after being stretched or compressed. Springs are used in some machines (such as clocks) to store energy, which can be released at a controlled rate. In other machines (such as engines) they are used to close valves.

In vehicle-suspension systems, springs are used to cushion passengers from road shocks. These springs are used in conjunction with shock absorbers to limit their amount of travel. In bedding and upholstered furniture springs add comfort.

spring

Springs occur where water-laden rock layers (aquifers) reach the surface. Water will flow from a well whose head is below the water table.

In geology, a natural flow of water from the ground, formed at the point of intersection of the water table and the ground's surface. The source of water is rain that has percolated through the overlying rocks. During its underground passage, the water may have dissolved mineral substances that may then be precipitated at the spring (hence, a mineral spring).

A spring may be continuous or intermittent, and depends on the position of the water table and the topography (surface features).

Spring

Community in southeastern Texas, 40 km/25 mi northwest of central Houston and just northwest of Houston International Airport; population (1990) 33,100. It is primarily residential.