Making a barometer with a jar and balloon is the central task on this lab sheet, which walks your student through stretching a balloon over a jar opening, threading a straw through the balloon, and marking a centimeter scale to track straw movement over several days. The observation table records date, time, straw level in centimeters, weather conditions, and open notes, giving grades 4-7 homeschoolers a genuine multi-day data set to analyze. A “How It Works” section explains the relationship between high pressure pushing the balloon down and low pressure allowing it to rise, connecting the physical instrument to the weather patterns your student is already watching.

This sheet fits naturally into a weather or earth science unit study, and it works as a standalone project without any prior lab sequence. Completing it asks your student to form a question, gather materials, follow a seven-step procedure, and write a conclusion, covering the full scientific method in one approachable build. The built-in science tip about keeping the barometer away from direct sunlight and drafts gives your homeschooler a real variable to think critically about before results come in.