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    Apr 24, 2020 · a significant potential to affect national security or the health and security of United States . 1 A face mask is a device, with or without a face shield, that covers the users nose and mouth Trump and 3M reach deal to allow N95 face masks to be Apr 07, 2020 · Trump and 3M reach deal to allow N95 face masks to be exported to Canada These imports will supplement the 35 million N95 respirators we currently produce per month in the United States

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    pH and Water - USGS

    Mar 02, 2019 · pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water. Face Masks and Surgical Masks for COVID-19:Manufacturing Answers to frequently asked questions about face masks and surgical masks, including manufacturing, purchasing, importing, and donating masks during the COVID-19 public health emergency.