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diff --git a/kalzium/src/tempunit.h b/kalzium/src/tempunit.h
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+#ifndef TEMPUNIT_H
+#define TEMPUNIT_H
+/***************************************************************************
+ *   Copyright (C) 2005 by Pino Toscano                                    *
+ *   toscano.pino@tiscali.it                                               *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.          *
+ ***************************************************************************/
+
+#include <qpair.h>
+#include <qstringlist.h>
+
+/**
+ * This class obtains all the info needed to work with the units of measure
+ * of temperature.
+ *
+ * It has static methods you can call to get the various infos. The most
+ * important methods is convert(), that performs conversions.
+ *
+ * @author Pino Toscano
+ */
+class TempUnit
+{
+	public:
+
+		enum Unit { Kelvin = 0, 
+			Celsius, 
+			Fahrenheit,
+			Rankine,
+			Reaumur 
+		};
+
+		/**
+		 * Convert the temperature unit @p value given in the unit
+		 * @p from to the unit @p to.
+		 *
+		 * @return the value converted
+		 */
+		static double convert( double value,
+		                       TempUnit::Unit from,
+		                       TempUnit::Unit to );
+
+
+		/**
+		 * @param value the temperature to convert
+		 * @param from the unit from which to convert
+		 *
+		 * @return the temperature to Kelvin
+		 */
+		static double convertToKelvin( const double value,
+				TempUnit::Unit from );
+		
+		/**
+		 * @overload
+		 */
+		static double convert( const double value,
+		                       int from,
+		                       int to );
+
+		/**
+		 * @return a list with the symbols of the temperature units
+		 * we support
+		 */
+		static QStringList unitListSymbols();
+
+		/**
+		 * @return the symbol of the @p i -th unit 
+		 */
+		static QString unitListSymbol( int i );
+
+		static QPair<double, double> rangeForUnit( TempUnit::Unit u );
+
+		/**
+		 * @overload
+		 */
+		static QPair<double, double> rangeForUnit( int u );
+
+};
+#endif // TEMPUNIT_H