Body & wellness activity
Lungs Like Balloons
Watch your chest rise and fall. Discover that your lungs are stretchy balloons inside you that fill up with air.
Materials and setup
- balloon (Pre-K)
- 1L clear plastic bottle, 2 balloons, tape, scissors (Kinder)
- 2L bottle, large tub, flexible tubing or straw, water, marker, measuring cup (Early Elem)
- sponge, paper, paper towel tube, small paper scraps (Upper Elem)
Parent note
Adult handles all scissors and bottle-cutting steps. Child with asthma or any respiratory condition: skip the forced-exhalation + peak-flow steps or modify to gentler breathing. The smoking section is intentionally graphic — contextualize for your family.
How this changes by age
Pre-K (ages 3–4)
Watch your chest rise and fall. Discover that your lungs are stretchy balloons inside you that fill up with air.
Steps
- Put both hands flat on your chest. Take a big slow breath in through your nose. Feel your chest get bigger.
- Breathe out through your mouth. Feel your chest get smaller. Say 'IN' and 'OUT' with each breath.
- With adult help, blow up a balloon a little, then let the air out slowly. 'This is what your lungs do all day — get big with air, then let it out.'
- Try a small breath, then a big breath. Which one makes your chest move more?
- Blow on a tissue held in your hand. Can you make it wave? Now breathe softly on it. Your lungs push the air.
- Draw two lung-balloons and color them bigger the deeper you breathe.
Learning objectives
- Notice their own breathing and the chest rising/falling
- Understand that lungs hold air and that breathing is automatic
- Describe the difference between a small breath and a big breath
Kindergarten (ages 5–6)
Build a working lung model from a bottle and balloons. See how your diaphragm pulls air into your lungs.
Steps
- Materials: 1 clear plastic bottle (1L), 2 balloons, scissors, tape. Adult cuts the bottle in half — keep the top half.
- Stuff one balloon neck-first into the bottle top, with the balloon opening stretched over the bottle mouth. Tape around the neck if it slips.
- Cut the second balloon across the middle — keep the bottom half (the rounded part). Stretch this across the cut bottom of the bottle and tape the edges so it makes a tight drumhead. This is your 'diaphragm'.
- Pull the drumhead balloon down gently. The balloon inside inflates — air was pulled in! Push up on the drumhead — the inside balloon deflates. You just made a lung!
- Now feel your own diaphragm: put a hand on your belly right below your ribs. Take a deep belly breath. Feel it push out? That is your diaphragm pulling down.
- Practice 5 slow belly breaths. Belly out on the in-breath, belly in on the out-breath. This is how singers and athletes breathe.
Learning objectives
- Build and operate a working model of lungs and diaphragm
- Identify the diaphragm on their own body
- Practice belly breathing as the most efficient breath
Early elementary (ages 6–8)
Measure your lung vital capacity — how much air your lungs can hold in a single breath — and compare it to family members.
Steps
- Materials: large clear 2L bottle, big tub or bowl, flexible tubing or straw, water, permanent marker.
- Fill the 2L bottle completely with water. Cover the opening with your hand, flip it upside down, and lower the opening into a tub half-filled with water. Uncover underwater so no air enters the bottle.
- Slide the tubing under the water and up into the bottle mouth so one end is inside the bottle and the other end sticks out of the tub.
- Take the biggest breath you can. Exhale all of it in one breath through the tube. Air bubbles push water out of the bottle. Mark the new water line with a marker — that space equals your vital capacity.
- Pull the tube out. Measure vital capacity: refill the bottle with water to the mark using a measuring cup, tracking mL. Record: name + mL exhaled. Typical kid range: 1000-2500 mL.
- Test each family member and graph results. Older children usually have larger lungs; tall adults have the largest. Does height correlate with capacity?
- Try 3 conditions per person: normal breath-out, forced breath-out after maximum inhale, and breath-out after running in place for 1 minute. Compare.
- Write 3 sentences on what you learned about lung size and breathing.
Learning objectives
- Measure vital capacity using a water-displacement technique
- Collect and compare lung-capacity data across family members
- Recognize the relationship between body size and lung capacity
Upper elementary (ages 8–10)
Investigate alveolar surface area, respiratory exchange, and the health impact of smoking and pollution on lung function.
Steps
- Research alveoli: the lungs contain about 300-500 million tiny air sacs that together create ~70 square meters of gas-exchange surface — about the size of half a tennis court, folded into your chest.
- Surface-area demo: compare a flat sheet of paper to a crumpled sponge. Which has more surface in the same space? Lungs use the same trick — crumpled structures pack more area into a small volume.
- Learn the gas exchange: you breathe in ~21% oxygen, ~0.04% CO2. You breathe out ~16% oxygen, ~4% CO2. Your body used the missing 5% of oxygen and added 4% CO2 from cell respiration.
- Build a simple lung-function test: measure peak flow (how fast you can exhale). Blow as hard as you can through a paper towel tube held 10 cm from a row of 10 paper scraps on a table. Count how many scraps you blew off the table.
- Run a smoking-impact thought experiment: research 3 effects of smoking on lungs (tar coating alveoli, cilia paralysis, emphysema / alveolar destruction). Write a paragraph explaining how each reduces vital capacity.
- Design an anti-smoking PSA poster aimed at 4th graders. Use 3 specific facts from your research.
- Extension experiment: measure peak flow again AFTER 10 minutes of aerobic exercise. Does it go up or down? Why? (Up — airways dilate to move more air.)
Learning objectives
- Explain how alveolar surface area enables rapid gas exchange
- Compare inhaled and exhaled gas composition
- Evaluate how smoking and pollution impair lung function
Safety and evidence note
Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.
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