Observable definition here...
What characterizes...
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AbsorbedDoseRate
AbsorbedDose
Acceleration
AmountOfSubstance
Angle
AngularAcceleration
AngularJerk
AngularVelocity
Audio
Bias
CalendarTime
ChemicalConcentration
Color
ConfigurationState
CountRate
Count
DataRate
Density
Description
Distance
DoseEquivalent
Duration
DynamicViscosity
Efficiency
ElectricCapacitance
ElectricChargeDensity
ElectricCharge
ElectricCurrentDensity
ElectricCurrent
ElectricField
ElectricPotential
ElectricResistance
Energy
Extent
Force
Gain
GraphicsState
HealthState
Humidity
Identifier
Illuminance
Image
IndexOfRefraction
Irradiance
Jerk
Kind
KinematicViscosity
LuminousIntensity
MassFlowRate
Mass
Metric
Mode
NonPhysicalAddress
OperationalState
Order
OrientationAcceleration
OrientationJerk
OrientationVelocity
Orientation
Polarization
Position
Power
Pressure
Probability
RadiantIntensity
Ratio
Resolution
ScalarAcceleration
ScalarArea
ScalarJerk
ScalarVolume
Sensitivity
Size
Speed
TemperatureDelta
Temperature
TemporalFrequency
Torque
Uncertainty
UniqueIdentifier
ValidityState
Velocity
Video