What is the unit used to measure the thickness of the ozone layer? Scientists measure the amount of ozone gas in a column of air. To measure this, they use Dobson units (DU). Dobson was one of the first scientists to research ozone. One Dobâ¦son unit indicates 0.01 millimeter thickness of ozone gas in a column.
By common definition, a year is the length of time the earth takes to revolve around the sun in its orbit. The total number of days in a year is approximated to be about 365.24 days. However, this length varies based on the mode calculation used. The year calendar used is in sync with the four seasons experienced.
âºâº Number of days in 2015. 2015 is not a leap year, so there are 365 days in the year. You can also choose any day of the week and count how many times it occurs in 2015. Here are some shortcut links if you'd like to explore: