沸水的体積會否彭漲

In general, substances expand when heated, and contract when cooled.
When a substance, including water, is heated. Both the kinetic energy ans potential energy of molecules increase. The increase of kinetic energy leads to a rise in temperature of the substance. The increase of potential energy, which comes from the energy gained during heating by doing work against the intermolecular attractive force between molecules, leads to a larger separation between molecules, hence a macroscopic expansion of the substance.
[Be aware that water has a peculiar behaviour in which it contracts when its temperature increases from zero degree Celsius to 4 degree Celsius].
The evporation of dissolved gases when water is heated does not cause a reduction in volume because the gases are "dissolved" in water. That is to say, the gas molecules are residing in the "gaps" between the water molecules, hence taking up no extra space.

沸水的體積會比冷水大些少..這是因為熱脹冷縮的原理...其實沸水蒸發的水分5系好多..但是膨脹左好多..所以依然沸水體積會比較大。..

係丫....沸水既體係會比冷水大。
因為加熱之後…份子有較多能量，會不規則移動，互相撞擊，引致彭脹。