ELECTRICAL RESISTANCE UNDER PRESSURE, INCLUD- 

 ING CERTAIN LIQUID METALS. 



By p. W. Bridgman. 



Received October 13, 1920. Presented October 13, 1920. 



CONTENTS. 



Page. 



Introduction 61 



Experimental Method 63 



Detailed Data for Individual Substances 67 



Lithium, soUd and liquid 67 



Sodium, solid and liquid 76 



Potassium, solid and liquid 82 



Magnesium 88 



Calcium 91 



Strontium 96 



Mercury, solid and liquid 99 



Gallium, solid and liquid 104 



Titanium .112 



Zirconiiun 112 



Arsenic 113 



Bismuth, liquid 114 



Tungsten 117 



Lanthanum 120 



Neodymimn 122 



Carbon, amorphous and graphitic 123 



Sihcon 125 



Black Phosphorus 126 



Iodine .' 131 



Chromel A 132 



Chromel B 133 



Chromel C 133 



Comet 134 



Therlo • 135 



#193 Alloy 137 



General Survey of Results 138 



Normal Sohds 138 



Abnormal Solids 142 



Normal Liquids 143 



Abnormal Liquid 145 



Relative Behavior of the Same Metal in the Solid and Liquid States . 146 



Alloys 149 



Theoretical Bearings 150 



Summary 153 



Introduction. 



In an earlier investigation ^ I have determined the effect of pressure 



on tlie resistance of a number of the metaUic elements, and ha\e 



considered the significance of the results for theories of metallic con- 



