If you ever swam in a pool and your eyes began to sting and turn red, you felt the effects of an incorrect ph level. ph measures the concentration of hydronium ions and can be modeled by the function p(t) = −log10t. the variable t represents the amount of hydronium ions; p(t) gives the resulting ph level.
water at 25 degrees celsius has a ph of 7. anything that has a ph less than 7 is called acidic, a ph above 7 is basic, or alkaline. seawater has a ph just more than 8, whereas lemonade has a ph of approximately 3.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.