Ninth Grade Science Experiments (Page 195)

Seasonal Disease Outbreaks

Science Fair Project Idea

Scientific Method

"Flu season" is something we deal with every winter. Cyclical or seasonal outbreaks of an infectious disease can occur for a variety of reasons, such as seasonal changes in host behavior (for example, more people staying indoors), the seasonal abundance of disease carriers (for example, mosquitos), and many others. Another factor that can play a role in cyclical outbreaks occurs when the natural immunity to a disease has a short duration. This enables each individual in the population to… Read more

Seasons Science: Weekly Science Project Idea and Home Science Activity Spotlight

Blog Post

In this week's spotlight: an astronomy project that lets students and families use a simple homemade setup to better understand the way the tilt of the Earth's axis causes seasons. When a surface is titled, how does the light reaching it change? With a flashlight, a cardboard box, and some ordinary paper, you can get hands-on and experiment! The Reasons for the Seasons (full Science Buddies Project Idea) Seasonal Science: The Reasons for the Seasons (science activity at… Read more

Seawater Science: Model Ocean Currents in Your Kitchen

STEM Activity

Have you ever wondered what causes ocean currents? Ocean currents have profound effects on the climates of the continents, especially those regions bordering on the ocean. For example, it’s thought that the Gulf Stream (a warm current around the North Atlantic Ocean) makes northwest Europe much warmer than it would otherwise likely be. In this science activity, you will model the behavior of these “rivers” of hot and cold water within the ocean to find out how temperature… Read more

Seed Dispersal Science: Carried by the Wind

Blog Post

Explore the ways in which the shape and size of a seed influences how far it may travel when carried or blown by wind. What characteristics help seeds travel long distances by wind? Photo: Ragesoss, Wikimedia Commons If you hold a dandelion to your lips and blow, the seeds scatter through the air. This scattering, also called dispersal, helps distribute seeds which helps plants reproduce. Wind can carry seeds away from their plants, but how far a seed… Read more

Seeing Beyond the Visible: Photography with Near Infrared Illumination

Science Fair Project Idea

Scientific Method

Have you ever wondered what it would be like to have an extra sense? What if you could hear above the normal range (ultrasound) like dogs or bats? What if you could see ultraviolet light, like bees or juvenile trout? What if you could see infrared light, like a rattlesnake or boa constrictor? This project shows you how you can use a phone or camera, tripod, and a special filter to take pictures using near infrared illumination. It's a whole new way of looking at the world. Read more

Seeing Science: The Size of the Full Moon Rising

STEM Activity

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Have you ever noticed how the moon appears bigger at the horizon, just as it is rising over the treetops, than it does later in the evening when it is overhead? Of course, the size of the moon does not change, but our perception of its size changes based on where it is in the sky. In this activity, you’ll investigate Emmert’s law, which helps explain the full moon illusion, and estimate the size of the perceived increase in size of the moon at the horizon. Then you… Read more

Seeing Science: Why do Video Game Characters Look Better Today?

STEM Activity

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Have you ever wondered why video games today look better than video games from the 1980s? Today we have video games with relatively realistic figures, a lot of color and a lot of details, but these were not really features of games from the early 1980s. One major change between then and now is the number of pixels, or dots on the screen, used to represent video game objects. In this science activity you will put your artistic talent to use and investigate whether increasing the number of pixels… Read more

Seeing Tonic Water Glow: Weekly Science Activity

Blog Post

In this week's spotlight: a chemistry-focused family science activity that puts light energy, ultraviolet light, and visible light on display. With ordinary tonic water and a black light, families can learn more about ultraviolet light. What happens to the glow when you add a bit of bleach to the tonic water? Put it to the test to find out! Explore Glow-in-the-Dark Water! (Science Buddies activity) Shining Science: Explore Glow-in-the-Dark Water! (science activity at Scientific… Read more

Sensing with Your Feet!

STEM Activity

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How many objects do you think you are touching with your hands every day? A lot! Every time you touch something, your hands are able to feel how smooth, cold, warm, or rough the object is. In fact, your hands and fingers are so good at sensing details of shapes and surface textures that they are able to identify an object just by touching and without seeing it! You probably know that already because you have tried that before. Here is the challenge though: Do you think your feet can do the… Read more

Separating Mixtures: Can You Design a Device to Do It?

Science Fair Project Idea

Scientific Method

Have you ever looked in the kitchen cupboard and found a container of tiny white grains, but you were not sure if they were sugar or salt? They look very similar. How could you tell them apart? Well, you know that sugar and salt taste very different. Taste is actually called a property, and properties are used to describe and identify different materials. Properties can also be used to physically separate things. In this science project, you will use different properties to create a way to… Read more

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