Never exert when inserting glass tubing into a rubber stopper, always lubricate the glass with glycerin first.

Evaporation: this is when warmth from the sun causes water from oceans, lakes, streams, ice and soils to rise into the air and turn into water vapour (gas). water vapour droplets join together to make clouds! condensation: this is when water vapour in the air cools down and turns back into liquid water.

C. control over the business

Is there any options, for this