.Electromagnetic-waves{width:126px; height:283px ;}
.heat-radiation1{width:134px; height:109px ;}
.Thermograph{width:306px; height:120px ;}
.Radiometer{width:162px; height:174px ;}
.Leslie-cube{width:104px; height:105px ;}
.pyrometer2{width:150px; height:136px ;}