At which altitude is the atmospheric pressure approximately half the MSL value (1013 hPa)?
The atmospheric pressure at approximately half the Mean Sea Level (MSL) value of 1013 hPa (hectopascals) is typically found at an altitude of around 5500 meters (approximately 18 000 feet) above sea level.
At this altitude, the atmospheric pressure decreases to around 506.5 hPa, which is roughly half of the standard sea level pressure. Keep in mind that actual pressure values can vary due to weather conditions and geographical location, but 5500 meters is a good approximation for where the pressure is about half of sea level pressure.
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