The PNR 12 measures the resistance a material provides against being pierced by a specifically shaped test body.
The USP (US Pharmacopeia) describes the consistency measurement by penetration method for microcrystalline wax, white petrolatum and carboxymethylcellulose sodium paste.
Download the full application report to see an example on how to measure white petrolatum.
National Gas receives funding to develop Gravitricity underground hydrogen storage system
One single rock salt mine - Winsford - has 23 <i>MILLION </i>cubic metres of void and even allowing for 10% of that void set aside for hazardous waste...