The vapor pressure of the water is lowered whenever a solute is added to a solvent because there are fewer solvent particles on the surface to evaporate. The diagram above shows that the vapor pressure of the solution is lower than that of the pure solvent, Therefore, the freezing point is also lowered.
Watch for signs of cervical dilation if you are near the end of your pregnancy. This indicates that you are in labor, and it's time to talk with your doctor or midwife. As the baby's head begins to press down on the opening of the uterus, the cervix will start to thin out and open.
1cm roughly equates with a Cheerio, 3 cm with a slice of banana, 4cm with a Ritz Cracker, 7cm with the top of a soda can, and 10cm with a bagel. As cervix dilation itself is not a reliable predictor of when labor will begin, knowing the degree of cervical dilation in advance of active labor is of little benefit. It also carries unnecessary risks, the first of which is introducing infection. It also increases the risk of starting preterm labor. Internal exams are not recommended for the above reasons until after 41 weeks when potentially facing a postdate induction. Then, cervical dilation can provide valuable information on whether induction is likely to be successful at that point.