Fermi estimate: count the windows across Tehran's homes and other buildings

Estimate how many windows there are in Tehran. Explain your structure and assumptions, and land on a single number. ```hint Pick a countable unit Find a unit you can tie directly to population and estimate the windows per unit. Then ask which buildings that unit leaves out. ``` ### Clarifying Questions - Does Tehran mean the city proper or the whole metropolitan area? - Should I count windows in all buildings or only in homes, and are vehicle windows excluded? - How should a window be counted: one framed opening however many panes it has, and what about storefront glass or the glass panels of office towers? ### What a Strong Answer Covers - A clear definition of what counts as a window and which area is in scope - An equation that separates homes from workplaces, schools and other buildings - Labeled assumptions with round numbers for population, household size and windows per unit, with correct arithmetic - A sanity check from another angle and a range that shows which assumption moves the answer most ### Follow-up Questions - Which single assumption changes your answer the most, and how would you check it quickly? - How would you adapt the model for a city whose housing is mostly detached houses rather than apartments? - If a window maker asked how many replacement windows Tehran needs each year, how would you extend this estimate?