Riddles for Science Fairs and STEM Showcases

I bubble and fizz when vinegar says hello. What am I?

I split white light into every color. What am I?

I whirl air in a bottle to show storms. What am I?

I carry data through copper and code. What am I?

I hover thanks to magnets that never touch. What am I?

I track plant growth in three labeled cups. What am I?

I predict how far a paper airplane glides. What am I?

I compare control and variable fairly. What am I?

I bloom in a petri dish. What am I?

I store solar energy from sunlight. What am I?

I prove results with bars and lines. What am I?

I explains what the project learned. What am I?

I measure heartbeats before and after exercise. What am I?

I float differently in salt and fresh water. What am I?

I remind students to wear goggles. What am I?

I am the board with title, question, and results. What am I?

I am the project part changed on purpose. What am I?

I am the result measured after the change. What am I?

I am the setup left unchanged for comparison. What am I?

I am the notebook full of observations. What am I?

I am the judge question after a demo. What am I?

I am the sticky note showing a visitor clue. What am I?

I am the volcano that erupts on cue. What am I?

I am the tiny world seen through lenses. What am I?

I am the bridge built from sticks and tested with weights. What am I?

I am the robot that follows a black line. What am I?

I am the poster stamp earned at each display. What am I?

I am the chart showing repeated trials. What am I?

I am the question that starts the whole project. What am I?

I turn a STEM booth into a puzzle stop. What am I?