Molten salt can be employed as a thermal energy storage method to retain thermal energy collected by a solar tower or solar trough of a concentrated solar power plant, so that it can be used to generate electricity in bad weather or at night.
In addition to a washer's external dimensions, you will also want to think about size of the washing drum inside the unit. Excluding compact units, most of which have a drum somewhere in the 2-cubic-foot range, the majority of standard-size front- and top-load washer drums today range from roughly 4 to 5 cubic feet. That's a great range for a typical 8-pound load.
The average washer or dryer each measures 27 inches wide, so you'll need at least 54 inches of space just to fit the units themselves. Lowe's Home Improvement recommends adding 1 inch on each side of each of these appliances to allow for proper air circulation, for a total width of 57 inches.