| |
Pa- Pa
- Protactinium is a radioactive element.
- Pa
- The SI derived unit of pressure is the pascal.
- Pagoda
- A temple or sacred building, typically in an Asian nation, usually pyramidal, forming a tower with upward curving roofs over the individual stories.
- Paint
- A generally opaque coating including resin, a solvent and additives.
- Paintbrush
- Brush used to apply paint.
- Pair Annihilation
- When a particle encounters its antiparticle, they annihilate each other, disappearing in a burst of photons.
- Pair Production
- The conversion of energy into matter in which a particle and its antiparticle are produced.
- Palindrome
- A positive integer whose digits read the same forward and backwards.
- Palladium
- A member of the platinum group of metals. It is silvery white in colour, is malleable and ductile, and is one of the most reactive in the group
- Panel Hammer
- A special hammer for metalworking.
- Panel Saw
- Also known as a hand saw.
- Paper
- Made by pressing a pulp of rags, straw and wood into thin sheets.
- Paper Glue
- Many different forms of paper glue, the most common being the solid stick form.
- Paraffin Oil
- A term describing a whole series of saturated aliphatic hydrocarbons, also known as alkane hydrocarbons.
- Paraffin Wax
- Obtained as a residue from the distillation of petroleum.
- Paraheliotropism
- Movement of a plant in response to light.
- Parallax
- Change in the apparent position of objects when viewed from two widely separated positions.
- Parallel
- Two or more lines are said to be parallel if they are in the same plane, but never intersect. Two or more planes are parallel if the planes never intersect.
- Parallel Planes
- Planes that have no points in common.
- Parallel Transfer
- A transfer of multiple bits from one register to another simultaneously.
- Parallelogram
- A quadrilateral in which opposite sides are parallel.
- Paramagnetism
- A relatively weak form of magnetism that results from the independent alignment of atomic dipoles (magnetic) with an applied magnetic field.
- Paraxial Optics
- Optical characteristics limited to infinitesimally small pencils of light.
- Parent Isotope
- An element that undergoes nuclear decay.
- Pareto Distribution
- A distribution used for random variables which are constrained to be greater or equal to 0.
- Paris Bronze
- A term given to brass containing 88% copper, 10% zinc and 2% lead used to produce trinkets and souvenirs.
- Parsec
- 1 Parsec = 3.2615 Light Years
- Partial Pressures
- The pressure exerted by a certain gas in a mixture.
- Particle Accelerator
- A device for accelerating charged particles to high velocities.
- Particle Velocity
- A fluctuating velocity superimposed by the presence of sound on the other velocities with the particles of the medium may have.
- Particulate
- Composed of distinct particles.
- Parting-off Tool
- A tool used in a lathe to cut the workpiece from the main stock held in the chuck.
- Partition
- A division between two volumes.
- Partition Function
- A central construct in statistics and statistical mechanics, and it is a bridge between thermodynamics and quantum mechanics because it is formulated as a sum over the energies of states of a macroscopic system at a given temperature.
- Parts Per Million
- Used to describe the amount of a trace element or substance present in the main substance.
- Parts Per Million by Volume
- Used to describe the amount of a trace element or substance present in the main substance as measured by volume.
- Parts Per Million by Weight
- Used to describe the amount of a trace element or substance present in the main substance as measured by weight.
- Pascal
- The SI derived unit of pressure.
- Pascal′s Law
- When an external pressure is applied to any confined fluid at rest, the pressure is increased at every point in the fluid by the amount of external pressure applied.
- Pascal′s Triangle
- Each number is the sum of the two numbers above. The sum of each row is equal to a power of 2.
- Paschen Series
- The series which describes the emission spectrum of hydrogen when the electron is jumping to the third orbital.
- Passive Absorber
- A sound absorber that dissipates sound energy as heat.
- Patent
- A document granting an inventor sole rights to an invention.
- Pathogen
- Any microorganism or substance that causes disease.
- Patina
- A thin layer of corrosion products with a distinctive colouration that forms on a metal surface exposed to air and water.
- Pattern Recognition
- A computational technique used to find patterns and develop classification schemes for data in very large data sets.
- Pauli Exclusion Principle
- No two electrons can have the same set of quantum numbers.
| |
