|
Term
|
Description
|
| Ice |
A solid, crystalline form of water. |
| Inches of Vacuum |
A scale in which atmospheric pressure is zero and a "perfect" vacuum is 30 inches (the height in a column of mercury supported by the vacuum) |
| Incipient Melting |
A precursor to melting characterized by changes in the properties of a frozen system, e.g. by a relatively rapid reduction in the electrical resistivity of a frozen sample with increasing temperature |
| Inert Gas |
A chemically inactive gas, most particularly nitrogen or any of the "truly" inert gases (helium, neon and argon) |
| Insoluble |
Unable to dissolve |
| Installation Qualification |
(IQ) Documented verification that all key aspects of the installation adhere to appropriate codes and approved design intentions. |
| Integral |
Control action that automatically eliminates offset or "droop" between set point and actual process temperature. Also referred to as reset |
| Interstage |
In a two stage compressor system, the cross over piping on compressors that connects the low side to the high side. |
| Interstage Pressure Regulating Valve |
The valve that controls the Interstage pressure from exceeding 80 to 90 psi. This valve opens to suction as the Interstage pressure rises above 80 to 90 psi |
| I/O |
Input/Output. |
| Isolation |
Separation. In electronics it is the electrical separation of a sensor from high voltage frequency. Allows for the application of grounded or ungrounded sensing element |
| Latent Heat |
The energy associated with a change of physical state under defined conditions |
| LED |
Light Emitting Diode |
| Liquid |
A state of matter intermediate between that of a solid and a gas in which molecules can move with respect to one another but form a virtually incompressible fluid that, under gravity, assumes the shape of a container vessel up to a definite level |
| Liquid Sub-Cooler Heat Exchanger |
A system in which the liquid refrigerant leaving the condenser/receiver is sub-cooled to a temperature of 15F to -15F (-10C to -25C) |
| Lyophilization |
(Freeze Drying) A process whereby a product is made to be chemically inactive by freezing, and then the solvents (primarily water) are removed via sublimation while the product is still in the frozen state and then by desorption, with the intent of creating a chemically inactive product that can be stored at temperatures close to room temperature or substantially above the product’s original freezing point.
|
| Lyoprotectant |
A substance included in a formulated product to prevent or reduce damage to an active ingredient during freeze drying |