Here's why:

* Chlorine is a gas: Chlorine (Cl₂) is a greenish-yellow gas at room temperature.

* Water is a liquid: Water (H₂O) is a liquid at room temperature.

* Reaction, not explosion: When chlorine gas dissolves in water, it undergoes a chemical reaction. It reacts with water to form hypochlorous acid (HOCl) and hydrochloric acid (HCl). This reaction is not explosive.

However, there are some important things to consider:

* Safety: While chlorine doesn't explode in water, it is a highly toxic gas. Inhaling chlorine can cause serious respiratory problems and even death.

* Bleach: When chlorine is dissolved in water, the resulting solution can be used as bleach. However, mixing bleach with other cleaning products can produce dangerous fumes, including chlorine gas.

* Pool safety: Chlorine is used to disinfect swimming pools. It is important to follow proper safety guidelines when using chlorine in a pool, as high concentrations can be harmful.

In short, chlorine does not explode when mixed with water. However, it is important to handle chlorine with care and follow proper safety precautions due to its toxicity.