Estimation: you can only research for simple data such as the air density, and the number of students in each sections of the freshman English class at your college or university (University of Massachusetts, Boston). Then show a process of calculations leading to your estimates.

Estimations: The goal of estimation is to get an order of magnitude of a quantity of interest using simple models. The following are two examples: 1) Estimate the mass of air that passes through your lungs per day: this can be done in a series of steps: a) Imagine the air that lls the rectangular thorax cavity will pass through your lungs. So rst estimate the volume of your thorax cavity in ma, that is, estimating the length of each side in m [1 m =3.28 ft) 523.5} ns: cam? off/61! M2169! Thorax volume {m3} = widthlm} x depthlm) x height{m} b) How many times do you fill your thorax cavity per minute? Keep in mind there are 60 seconds in a minute or use the stopwatch in your phone. Let's call this tfpm. c) Total volume of air that will pass through your lungs per day: vapd=Thorax volume x tfpm x60x24 (m3). For curiosity compare this with the volume of air in your room if it is tightly sealed: 6 m x 6 m x 3 m = 108 m3. How important it is to live and study in a ventilated room! d} Air density=Mass of Air/Volume of :'-\\ir=1kg/m3 (this is a constant) So Mass of Air=vpda x air density: 2) Estimate number of books checked out from Healey Library per week: a}What courses requires a 10-book reading list on campus?. How many sections are there each of these course. Total number of sections (tns)=number of courses x number of sections per course b} How many students typically per section (sps)? c) Total number of books checked out for courses {tnbc}=tns x sps x 10