.volumetric-expansion01{width:109px; height:78px ;}
.volumetric-expansion-formula{width:145px; height:134px ;}
.volumetric-expansion-problem{width:151px; height:83px ;}
.volumetric-expansion-problem2{width:159px; height:143px ;}
.volumetric-expansion-formula2{width:179px; height:62px ;}
.volumetric-expansion-problem3{width:162px; height:107px ;}
.volumetric-expansion-problem4{width:174px; height:211px ;}
.density{width:78px; height:53px ;}
.volumetric-expansion-formula3{width:151px; height:35px ;}
.volumetric-expansion-problem5{width:172px; height:107px ;}