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Mystery #4Tier 2water / forces / density

Why do you float more easily in the sea than in a swimming pool?

It's the same you, holding the same breath. Yet in the sea you bob about like a cork, while in a swimming pool you sink far more easily. You haven't changed at all between the two. So what has changed?

A person floating effortlessly on their back in the salty Dead Sea — Photo: Rob Bye · CC0 · via Wikimedia Commons

Your guess

What's different about sea water and pool water that could change how well you float?

Make a guess to unlock the hints and the answer.