Added dynamic viscosity

src/include/units/physical/dimensions.h

@@ -140,6 +140,9 @@ struct dim_concentration : derived_dimension<Child, U, exp<M, 1>, exp<L, -3>> {}
 template<typename Child, Unit U, DimensionOf<dim_luminous_intensity> I, DimensionOf<dim_length> L>
 struct dim_luminance : derived_dimension<Child, U, exp<I, 1>, exp<L, -2>> {};
 
+template<typename Child, Unit U, DimensionOf<dim_pressure> P, DimensionOf<dim_time> T>
+struct dim_dynamic_viscosity : derived_dimension<Child, U, exp<P, 1>, exp<T, 1>> {};
+
 }  // namespace physical
 
 template<typename T>
@@ -235,4 +238,7 @@ concept Concentration = physical::QuantityOf<T, physical::dim_concentration>;
 template<typename T>
 concept Luminance = physical::QuantityOf<T, physical::dim_luminance>;
 
+template<typename T>
+concept DynamicViscosity = physical::QuantityOf<T, physical::dim_dynamic_viscosity>;
+
 }  // namespace units

src/include/units/physical/si.h

@@ -31,6 +31,7 @@
 #include "si/constants.h"
 #include "si/current_density.h"
 #include "si/density.h"
+#include "si/dynamic_viscosity.h"
 #include "si/frequency.h"
 #include "si/inductance.h"
 #include "si/luminance.h"

src/include/units/physical/si/dynamic_viscosity.h

@@ -0,0 +1,47 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+#include <units/physical/dimensions.h>
+#include <units/physical/si/time.h>
+#include <units/physical/si/pressure.h>
+#include <units/quantity.h>
+
+namespace units::si {
+
+struct pascal_second : unit<pascal_second> {};
+struct dim_dynamic_viscosity : physical::dim_dynamic_viscosity<dim_dynamic_viscosity, pascal_second, dim_pressure, dim_time> {};
+
+template<Unit U, Scalar Rep = double>
+using dynamic_viscosity = quantity<dim_dynamic_viscosity, U, Rep>;
+
+inline namespace literals {
+
+// Pa·s
+constexpr auto operator"" q_Pa_s(unsigned long long l) { return dynamic_viscosity<pascal_second, std::int64_t>(l); }
+constexpr auto operator"" q_Pa_s(long double l) { return dynamic_viscosity<pascal_second, long double>(l); }
+
+}  // namespace literals
+
+}  // namespace units::si
+