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Section S S index 921-929 of 1376 terms
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state of ground—State of soil with regard to soil firmness and moisture content; ability to support equipment to work soil; soil temperature suitability for seed germination.
state of the sea—(Or sea state; also called sea.) A description of the properties of the wind-generated waves on the surface of the sea.
state of the sky—The aspect of the sky in reference to the cloud cover. The state of the sky is fully described when the amounts, kinds, directions of movement, and heights of all clouds are given.
state parameter—Same as state variable.
state variable—(Or state parameter, thermodynamic variable.) A term for pressure, temperature, and specific volume; other thermodynamic quantities that depend on these or other variables are often referred to as thermodynamic functions of state. In this sense, the equation of state specifies the relation among the state variables.
static energies—Measures of the thermodynamic state of the air, similar to potential temperature. For example, the dry static energy (also known as the Montgomery streamfunction) is where g is acceleration of gravity, z is height above some reference level (often taken as the height where the pressure is 100 kPa), Cp is specific heat at constant pressure, and T is absolute temperature. Typical atmospheric values are on the order of 300 kJ kg−1. Compare this static energy to one definition for potential temperature, See moist static energy, liquid water static energy, saturation static energy.
static energy—The sum of the enthalpy and potential energy per unit mass of dry air, given by where h is the static energy (unfortunately using the same symbol as that conventionally used for specific enthalpy), cpd is the specific heat at constant pressure of dry air, cw is the specific heat of liquid water, Lv is the latent heat of vaporization, rv and rt are the vapor and total water mixing ratios, T is the temperature, z is the height above the surface, and g is the acceleration of gravity. Static energy plus kinetic energy is conserved along steady-state trajectories under adiabatic reversible conditions.
static instability—See instability, static stability.
static level—In hydrology, the height to which water will rise in an artesian well. The static level of a flowing well is above the ground surface.
static pressure port—A termination device permitting pressure sensors to measure the true atmospheric pressure in the presence of winds.
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