<p>&Tau;&omicron; &epsilon;&kappa;&pi;&alpha;&iota;&delta;&epsilon;&upsilon;&tau;&iota;&kappa;ό &sigma;&epsilon;&nu;ά&rho;&iota;&omicron; &alpha;&nu;&alpha;&phi;έ&rho;&epsilon;&tau;&alpha;&iota; &sigma;&tau;&omicron; 2&omicron; &kappa;&epsilon;&phi;ά&lambda;&alpha;&iota;&omicron; &tau;&eta;&sigmaf; &Phi;&upsilon;&sigma;&iota;&kappa;ή&sigmaf; &Sigma;&tau;΄ &Delta;&eta;&mu;&omicron;&tau;&iota;&kappa;&omicron;ύ &quot;&Theta;&epsilon;&rho;&mu;&omicron;&kappa;&rho;&alpha;&sigma;ί&alpha; - &Theta;&epsilon;&rho;&mu;ό&tau;&eta;&tau;&alpha;&quot; &kappa;&alpha;&iota; &sigma;&upsilon;&gamma;&kappa;&epsilon;&kappa;&rho;&iota;&mu;έ&nu;&alpha; &sigma;&tau;&eta; &mu;&epsilon;&tau;ά&delta;&omicron;&sigma;&eta; &tau;&eta;&sigmaf; &theta;&epsilon;&rho;&mu;ό&tau;&eta;&tau;&alpha;&sigmaf; &mu;&epsilon; &alpha;&gamma;&omega;&gamma;ή (<a href="http://ebooks.edu.gr/ebooks/v/html/8547/2011/Fysika_ST-Dimotikou_html-empl/index_2.html">http://ebooks.edu.gr/ebooks/v/html/8547/2011/Fysika_ST-Dimotikou_html-empl/index_2.html</a>). &Gamma;&iota;&alpha; &tau;&eta; &delta;&iota;&alpha;&pi;ί&sigma;&tau;&omega;&sigma;&eta; &pi;&rho;&omicron;&eta;&gamma;&omicron;ύ&mu;&epsilon;&nu;&omega;&nu; &gamma;&nu;ώ&sigma;&epsilon;&omega;&nu; &tau;&omega;&nu; &mu;&alpha;&theta;&eta;&tau;ώ&nu; &kappa;&alpha;&iota; &tau;&eta;&nu; &alpha;&nu;&alpha;&kappa;ά&lambda;&upsilon;&psi;&eta; &tau;&omega;&nu; &nu;έ&omega;&nu; &epsilon;&nu;&nu;&omicron;&iota;ώ&nu;, &theta;&alpha; &chi;&rho;&eta;&sigma;&iota;&mu;&omicron;&pi;&omicron;&iota;&eta;&theta;&omicron;ύ&nu; &epsilon;&nu;&nu;&omicron;&iota;&omicron;&lambda;&omicron;&gamma;&iota;&kappa;ό&sigmaf; &chi;ά&rho;&tau;&eta;&sigmaf;, &pi;&epsilon;ί&rho;&alpha;&mu;&alpha; &kappa;&alpha;&iota; &delta;&upsilon;&nu;&alpha;&mu;&iota;&kappa;ή &omicron;&pi;&tau;&iota;&kappa;ή &alpha;&nu;&alpha;&pi;&alpha;&rho;ά&sigma;&tau;&alpha;&sigma;&eta;&nbsp;&tau;&omicron;&upsilon; &phi;&alpha;&iota;&nu;&omicron;&mu;έ&nu;&omicron;&upsilon;.</p>