911 Carrera Cabriolet (997) F6-3.6L (2007)
ppq
Abbreviation for "parts per quadrillion". 1 ppq = 1 quadrillionth of the volume or weight = 1 picogramm per kilogram (pg/kg).
ppt
Abbreviation for "parts per trillion". 1 ppt = 1 trillionth of the volume or weight = 1 nanogram per kilogram (ng/kg).
Precautionary principle
Precaution as a goal to which environmental policy is committed; serves to defend against possible threats and to remedy existing damage, as well as to
protect the natural resources and ensure their temperate use.
Precipitation
Precipitation is:
1. Meteorology: the small particles dropping (condensing) from humid air: under 0.5 millimeters is drizzle, over 0.5 millimeters is rain.
2. major component of air pollution, Dust
3. Chemistry: more or less finely distributed substances that form and settle as the result of a reaction in a solution; especially used in chemical
analysis.
Precipitation procedure
The conversion of soluble compounds into insoluble compounds by adding appropriate chemicals. The resulting precipitation product can be separated
using appropriate physical procedures (e.g. sedimentation, flotation or filtration).
Preparations
Chemical products resulting from a deliberate mixture or solution of substances, e.g. paints, disinfection agents, pesticides and washing agents.
Process heat
The heat (energy) that is necessarily released in chemical, physical and nuclear processes. This heat can either be used for technical applications or has to
be cooled using water for example, which could lead to warming of bodies of water.
Propellants
Agents used in aerosols and inhalants (See: Aerosols); compressed (e.g. N2, CO2, N2O) or liquefied (See: lower Hydrocarbons) gases, used in spray
cans for example.
PS
See: Polystyrene
PTB
Abbreviation for the German Federal Institute for Physical Technology (Physikalisch-Technische Bundesanstalt); headquarters: Braunschweig.
Public health system
This refers to the public and private facilities in a country, which serve to maintain or restore and promote the health of the population. The legislation
pertaining to the public health system in Germany is based on article 74 of the German Consitution and is divided between the Federal and state
governments. The Federal Ministry for Family, Elderly, Women and Youth is responsible for administration of the national public health system. At state
level, the state ministries of health and the senators are the guiding authorities responsible for preparing and implementing state health laws.
Pure water
Water that has undergone treatment.
PVC
See: Polyvinyl chloride.
Pyrolysis