Two identical balloons were filled up with the same exact amount of air. One was placed in the freezer, and the other allowed to stay at room temperature. At the beginning the circumference was measured at 30 cm around. After the balloon was taken out of the freezer a day later, the circumference for the freezer balloon had decreased to 25 cm. The room temperature balloon had no change in circumference.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

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1) a giant star is a star with a radius much larger than that of our sun (even hundreds of times bigger). they can be either blue giants or red giants: in the first case, the surface temperature is very high, higher than that of the sun, while in the second case the surface temperature can be lower than that of the sun. the same applies to the mass: blue giants are very massive stars, burning quickly their nuclear fuel, while red giants can have small masses (a little bit bigger than that of our sun).

2) we can find giant stars in the upper part of the hr diagram, blue giants will be on the upper left corner since they have high luminosity and high temperature, while red giants will be on the upper right corner, having high luminosity but low temperature.