What This Actually Is (Or Isn't)
I have gone through a lot of educational content over the years, and I need to be honest about this one. "Apple Science Experiments For Preschoolers" does not appear to be an official Apple product, program, or downloadable resource. There is no App Store listing, no documentation on developer.apple.com, and no curriculum that Apple publishes under that name. What you will find online are blog posts and Pinterest boards that use the word "apple" as in the fruit, not the company. This distinction matters because a lot of pages targeting this exact search phrase are either affiliate-driven content farms or random parenting blogs with no verification. If you are looking for something you can genuinely use with a preschooler, you need to separate the fruit-based ideas from anything claiming to come from Apple Inc.
Apple Science Experiments For Preschoolers — Clarifying the Confusion
The search term pulls together two completely different subjects. Most results about apples and science are fine on their own. They typically involve sinking and floating, color mixing with food dye, or observing how a cut apple browns over time. These are legitimate hands-on activities. The problem is that some of these pages title themselves with capitalized phrases that make it look like an official curriculum when it is not. I once spent about forty-five minutes going through a site that promised a complete "Apple Science Experiment kit" with printable worksheets and a video course. There was no kit. There were three blog paragraphs and a download link that led to a PDF full of generic science fair project ideas unrelated to apples. That is the kind of waste I am talking about.
What Actually Works With Real Apples
If you want to do science with preschoolers using apples, here are the activities that hold up in practice, not just on paper. Fill a large bowl with water. Place a whole unwashed apple in it. It floats. Peel the apple and place it in the water again. It sinks. The peel traps air and changes the density enough to keep it afloat. A three-year-old can watch this happen and will usually want to repeat it five more times. That is normal. Do not try to explain Archimedes' principle. Just let them observe and talk about what they see. Cut an apple in half and leave the cut surface exposed. Check it every ten minutes. You will see the color shift from pale yellow to light brown to dark brown over about twenty to thirty minutes. You can slow the process by brushing lemon juice on one half. This introduces the idea that something in the air is reacting with the fruit. Preschoolers notice the color change immediately and will ask why. The simple answer is that oxygen is touching the apple and changing it. That is accurate enough for that age group.
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Cut an apple horizontally across the middle, not vertically. The star shape inside becomes visible. Point out the seeds arranged in a pattern. This is a visual that most kids do not expect and it tends to hold their attention longer than a vertical cut. You can let them remove the seeds and plant a few in damp paper towels inside a plastic bag to watch germination over one to two weeks. Not all seeds will sprout, and that is fine. The point is the observation, not the result. The biggest issue is trying to turn these into lessons with learning objectives written out like a teacher's manual. Preschoolers do not learn science by filling out a worksheet about what they just did. They learn by doing it again and seeing something different happen. If you structure it too rigidly, you lose them within three minutes. Another mistake is using small apple seeds or whole apples with children under three without direct supervision. Choking is a real risk. I learned that the hard way when a neighbor's kid tried to swallow a seed whole during one of these activities. It passed without issue, but it was not something to risk repeating without talking to a pediatrician first and adjusting the activity for the child's age.
Some sites suggest using red cabbage juice as an indicator with apple juice to demonstrate pH. That works technically, but the color change is very subtle with apple juice because it is only mildly acidic. The result is underwhelming for a young child who wants to see something dramatic. If you want a clear pH demo, use baking soda solution or vinegar instead. Apple juice will disappoint.
Where to Find Reliable Versions of These Activities
The Kids Cooking & Science section on the Apple store website sometimes features parent-tested activities, though they are not labeled as a formal curriculum. More useful sources are the NASA Climate Kids page for basic concepts, Scholastic's science activities for early learners, and the Smithsonian's National Museum of Natural History educator resources. None of these use the exact phrase you searched for, but they cover the same ground with better fact-checking. YouTube has a lot of channels demonstrating these experiments. The ones worth watching are from verified science education accounts like SciShow Kids or The Magic School Bus Rides Again. Skip the channels with thousands of videos titled exactly like your search query. Those are usually recycling the same content with minor variations and no real expertise behind them.

What This Approach Does Not Do Well
Apple-based experiments are limited in scope. They cover density, oxidation, and basic botany. They do not introduce measurement, data recording, or controlled variables in a way that preschoolers can grasp. If your goal is to build a longer science habit, you will need to branch out to other materials like magnets, water play with measuring cups, or growing beans in clear cups. The apple activities are a starting point, not a curriculum. There is also the seasonal constraint. Apples are not equally available year-round in many regions, and organic options vary by store. I have had situations where the apples I bought were too dry or too mealy for the sink-or-float test to work cleanly. The fruit quality matters more than people expect. Buy firm apples for the float test and softer ones for cutting and observing oxidation. The difference is noticeable. These activities also assume access to basic kitchen supplies and a space where water spills are acceptable. If you live in a small apartment without a sink nearby, the sink-or-float experiment becomes a logistical hassle. A large bin and a towel are the minimum setup, and even then you are managing splashes. That is a practical bottleneck worth considering before you commit to any of these.