Goodbye privacy, hello 'Alexa': Amazon Echo, the home robot who hears it all. We had Rory Carroll invite âAlexaâ aka the Echo into his home. There was helpful cooking assistance, endless facts and figures, an amusing misunderstanding â and concerns over what exactly Amazon does with all that interaction data. Rory Carroll in Los Angeles.
Aqua regia or Royal water can dissolve metals. It is a mixture of conc.nitric acid and conc.hcl in the ratio of 1:3. Remember none of the above mentioned acids will dissolve the metals in the absence of other. adhi Â· 9 years ago.
1 Type metal should be easy to cast, this means: a reasonable low melting temperature, iron should not dissolve in the molten metal, mould and nozzles should stay clean and easy to maintain. 2  The molten metal should be clean, while molten it should give as little dross as possible, to prevent loss of tin and antimony.