A piece of chalk has a mass of 65 grams and a volume of 25 cubic centimeters. What is its density?

To find the density, you divide the mass by the volume. So, for the piece of chalk, you take 65 grams and divide it by 25 cubic centimeters. Doing the math, you get a density of 2.6 grams per cubic centimeter. Density is like a little cheat sheet for understanding how heavy something is for its size – the higher the number, the "heavier" it feels! Did you know that density plays a huge role in everything from making sure ships float to understanding why some objects sink? For example, ice is less dense than water, which is why it floats! This concept isn't just useful in science class; it’s also part of everyday life, like when you're trying to figure out whether a pumpkin will bob in a Halloween party game!