Problem: Phase change materials such as paraffin wax and Glauber's salt are another thermal storage media. These materials are inexpensive, readily available, and can deliver domestically useful temperatures (approximately 64 °C or 147 °F). The "Dover House" (in Dover, Massachusetts) was the first to use a Glauber's salt heating system, in 1948. Solar energy can also be stored at high temperatures using molten salts. Salts are an effective storage medium because they are low-cost, have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems. The Solar Two used this method of energy storage, allowing it to store 1.44 terajoules (400,000 kWh) in its 68 cubic metres storage tank with an annual storage efficiency of about 99%.
What are some examples of phase change materials?
The answer is the following: paraffin wax and Glauber's salt

Problem: Dutch vocabulary is predominantly Germanic in origin, with an additional share of loanwords of 20%. The main foreign influence on Dutch vocabulary since the 12th century and culminating in the French period has been French and (northern) French, accounting for an estimated 6.8%, or more than a third of all loanwords. Latin, that has been spoken for centuries in the south of the Low Countries, and has since then for centuries plaid a major role as the language of science and religion, follows with 6.1%. High German and Low German, influential until the mid of the 19th century, account for 2.7%, but are mostly unrecognizable since many German loanwords have been "Dutchified", e.g. German "Fremdling" become Dutch "vreemdeling". From English, Dutch has taken over words since the middle of the 19th century, as a consequence of the gaining power of Britain and the United States. The share of English loanwords is about 1.5%, but this number is still on the increase. Conversely, Dutch contributed many loanwords to English, accounting for 1.3%.
What language has exerted the most influence on Dutch vocabulary since the 12th century?
The answer is the following: French

Problem: Portugal lost much of its wealth and status with the destruction of Lisbon in a 1755 earthquake, occupation during the Napoleonic Wars, and the independence of Brazil, its wealthiest colony, in 1822. After the 1910 revolution deposed the monarchy, the democratic but unstable Portuguese First Republic was established, later being superseded by the "Estado Novo" right-wing authoritarian regime. Democracy was restored after the Portuguese Colonial War and the Carnation Revolution in 1974. Shortly after, independence was granted to all its colonies, with the exception of Macau, which was handed over to China in 1999. This marked the end of the longest-lived European colonial empire, leaving a profound cultural and architectural influence across the globe and a legacy of over 250 million Portuguese speakers today.
How many Portugese speakers are there today?
The answer is the following: 250 million

Problem: From 1525 to 1917 14,503 titles were published in Estonian, as opposed to the 23,868 titles which were published between 1918 and 1940.[citation needed]
In the years between 1918 and 1940 how many Estonian language books were printed?
The answer is the following:
23,868