Merge branch 'master' into more-encompassing-number-skips

samples/Modelica/NewtonCooling.mo

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+within ModelicaByExample.PackageExamples;
+model NewtonCooling
+  "Cooling example importing physical types from the Modelica Standard Library"
+  import Modelica.SIunits.Temperature;
+  import Modelica.SIunits.Mass;
+  import Modelica.SIunits.Area;
+  import ConvectionCoefficient = Modelica.SIunits.CoefficientOfHeatTransfer;
+  import SpecificHeat = Modelica.SIunits.SpecificHeatCapacity;
+
+  // Parameters
+  parameter Temperature T_inf=300.0 "Ambient temperature";
+  parameter Temperature T0=280.0 "Initial temperature";
+  parameter ConvectionCoefficient h=0.7 "Convective cooling coefficient";
+  parameter Area A=1.0 "Surface area";
+  parameter Mass m=0.1 "Mass of thermal capacitance";
+  parameter SpecificHeat c_p=1.2 "Specific heat";
+
+  // Variables
+  Temperature T "Temperature";
+initial equation
+  T = T0 "Specify initial value for T";
+equation
+  m*c_p*der(T) = h*A*(T_inf-T) "Newton's law of cooling";
+end NewtonCooling;