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What does it mean for meth or any other compound to be 'pure'?

In Breaking Bad, Walter White can cook 99.1%$99.1\%$ pure meth. In general what does it mean for a substance to be pure? In this case, what exactly does it mean for meth to be pure? Does higher purity mean less unhealthy? More addictive? Giving more euphoria for the user?

For comparison, is the purity of prescribed methamphetamine or methylphenidate to people with ADHD or narcolepsy close to 100%$100\%$? My guess is that purity is how close Walt's product is with legal meth.

What does it mean for meth to be 'pure'?

In Breaking Bad, Walter White can cook 99.1% pure meth. In general what does it mean for a substance to be pure? In this case, what exactly does it mean for meth to be pure? Does higher purity mean less unhealthy? More addictive? Giving more euphoria for the user?

For comparison, is the purity of prescribed methamphetamine or methylphenidate to people with ADHD or narcolepsy close to 100%? My guess is that purity is how close Walt's product is with legal meth.

What does it mean for meth or any other compound to be 'pure'?

In Breaking Bad, Walter White can cook $99.1\%$ pure meth. In general what does it mean for a substance to be pure? In this case, what exactly does it mean for meth to be pure? Does higher purity mean less unhealthy? More addictive? Giving more euphoria for the user?

For comparison, is the purity of prescribed methamphetamine or methylphenidate to people with ADHD or narcolepsy close to $100\%$? My guess is that purity is how close Walt's product is with legal meth.

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3 Let me remove that biochemistry tag again for you; this is not biochemistry.
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In Breaking Bad, Walter White can cook 99.1% pure meth. In general what does it mean for a substance to be pure? In this case, what exactly does it meantmean for meth to be pure? Does higher purity mean less unhealthy? More addictive? Giving more euphoria for the user?

For comparison, is the purity of prescribed methamphetamine or methylphenidate to people with ADHD or narcolepsy close to 100%? My guess is that purity is how close Walt's product is with legal meth.

In Breaking Bad, Walter White can cook 99.1% pure meth. In general what does it mean for a substance to be pure? In this case, what exactly does it meant for meth to be pure? Does higher purity mean less unhealthy? More addictive? Giving more euphoria for the user?

For comparison, is the purity of prescribed methamphetamine or methylphenidate to people with ADHD or narcolepsy close to 100%? My guess is that purity is how close Walt's product is with legal meth.

In Breaking Bad, Walter White can cook 99.1% pure meth. In general what does it mean for a substance to be pure? In this case, what exactly does it mean for meth to be pure? Does higher purity mean less unhealthy? More addictive? Giving more euphoria for the user?

For comparison, is the purity of prescribed methamphetamine or methylphenidate to people with ADHD or narcolepsy close to 100%? My guess is that purity is how close Walt's product is with legal meth.

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