Hi
- HI
- Chemical formula for Hydrogen Iodide.
- Hidden Line
- Broken line used to signify a line that normally would not be seen in a drawing.
- Hidden Lines
- Broken lines used to signify lines that normally wouldn't be seen in a drawing.
- High Carbon Steel
- Steel with a carbon content greater than 0.85%.
- High Current Arc Ignition Test
- Required testing for a material that is in contact with or in close proximity to uninsulated live parts (typically 0.80 mm for non-arcing parts or 12.5 mm for arcing parts).
- High Frequency
- The portion of the electromagnetic spectrum between 3000 kHz and 30,000 kHz.
- High Impact Characteristics
- Product and/or process characteristics that, when outside of the specification tolerance, severely affect subsequent manufacturing operations or customer satisfaction.
- High Level Language
- A computer language with commands that do not directly represent the machine instructions.
- High Pass Filter
- A filter that passes signal frequencies above a specific, or cut off, frequency is called a high pass filter.
- High Performance Liquid Chromatography
- An efficient form of column chromatography that pumps a liquid solution of the sample at very high pressure through a column packed with a stationary phase made of very tiny particles.
- High Performance Vehicle
- A vehicle designed with high levels of performance in certain areas. Normally high power engine to give high accleration rates or top speed.
- High Power Effects
- Interference effects that occur in the presence of strong signals.
- High Speed Steel
- About 6 times harder than carbon steel and used extensively for machine tools.
- High Spin Complex
- A metal-ligand complex with the same number of unpaired electrons as the uncomplexed metal ion.
- High Temperature Proton Exchange Membrane Fuel Cell
- A variant of the PEMFC which uses a mineral acid based electrolyte rather than an aqueous one and can operate at temperatures up to 200°C.
- High Tension
- A comparative term used in electronics to denote high voltages.
- High Tension Leads
- High voltage wire from the ignition coil.
- High Voltage Arc Resistance to Ignition Test
- Required by various end-product standards when the material is used in contact with uninsulated live parts.
- High Voltage Arc Tracking Rate
- Required of the material when it is used in contact with or in close proximity (within 0.80 mm) to uninsulated live parts.
- High-Definition Multimedia Interface
- A compact audio visual interface for transmitting uncompressed digital data.
- Higher Heating Value
- The standard measure of the energy released during combustion of a fuel, assuming the product water is in the liquid state.
- Highest Useful Compression Ratio
- The highest compression upto which no knocking occurs in a given engine.
- High-Field Emission
- The discharge of electrons from the surface of a material subjected to a strong electric field.
- High-Intensity Gamma
- A level a gamma radiation flux on the order of 10E4 roentgens or higher.
- Highway Fuel Economy Driving Schedule
- One of the two EPA fuel economy tests, which consists driving routines, or schedules, performed in the laboratory.
- High-Wing Monoplane
- An aircraft which has its single wing mounted high on the fuselage.
- Hinge
- A type of mechanical bearing formed between two parts allowing one to be rotated relative to the other e.g. door hinges.
- Hipparchus
- A Greek astronomer who carried out his observations at Rhodes.
- Hippocrates
- He believed that "the four fluids or humours of the body (blood, phlegm, yellow bile and black bile) are the primary seats of disease."
- Histogram
- A graphical display showing the distribution of data values in a sample by dividing the range of the data into non-overlapping intervals and counting the number of values which fall into each interval.
- History
- Lists all History topics in the Encyclopaedia
- Hits Per Scan
- The number of times an RF beam strikes a target per antenna revolution.