QUES: The quality of a vacuum is indicated by the amount of matter remaining in the system, so that a high quality vacuum is one with very little matter left in it. Vacuum is primarily measured by its absolute pressure, but a complete characterization requires further parameters, such as temperature and chemical composition. One of the most important parameters is the mean free path (MFP) of residual gases, which indicates the average distance that molecules will travel between collisions with each other. As the gas density decreases, the MFP increases, and when the MFP is longer than the chamber, pump, spacecraft, or other objects present, the continuum assumptions of fluid mechanics do not apply. This vacuum state is called high vacuum, and the study of fluid flows in this regime is called particle gas dynamics. The MFP of air at atmospheric pressure is very short, 70 nm, but at 100 mPa (~6997100000000000000♠1×10−3 Torr) the MFP of room temperature air is roughly 100 mm, which is on the order of everyday objects such as vacuum tubes. The Crookes radiometer turns when the MFP is larger than the size of the vanes.
What does the MFP of residual gases show?

ANS: average distance that molecules will travel between collisions with each other.

QUES: Nasser's street following was still too small to sustain his plans for reform and to secure him in office. To promote himself and the Liberation Rally, he gave speeches in a cross-country tour, and imposed controls over the country's press by decreeing that all publications had to be approved by the party to prevent "sedition". Both Umm Kulthum and Abdel Halim Hafez, the leading Arab singers of the era, performed songs praising Nasser's nationalism. Others produced plays denigrating his political opponents. According to his associates, Nasser orchestrated the campaign himself. Arab nationalist terms such "Arab homeland" and "Arab nation" frequently began appearing in his speeches in 1954–55, whereas prior he would refer to the Arab "peoples" or the "Arab region". In January 1955, the RCC appointed him as their president, pending national elections.
What was too small to keep Nasser in power?

ANS: street following

QUES: In the late 1130s, Arnold of Brescia, an Italian canon regular became one of the first theologians to attempt to reform the Roman Catholic Church. After his death, his teachings on apostolic poverty gained currency among Arnoldists, and later more widely among Waldensians and the Spiritual Franciscans, though no written word of his has survived the official condemnation. In the early 1170s, Peter Waldo founded the Waldensians. He advocated an interpretation of the Gospel that led to conflicts with the Roman Catholic Church. By 1215, the Waldensians were declared heretical and subject to persecution. Despite that, the movement continues to exist to this day in Italy, as a part of the wider Reformed tradition.
Where does the Waldensian movement still exist currently?

ANS: Italy

QUES: A second New Haven gastronomical claim to fame is Louis' Lunch, which is located in a small brick building on Crown Street and has been serving fast food since 1895. Though fiercely debated, the restaurant's founder Louis Lassen is credited by the Library of Congress with inventing the hamburger and steak sandwich. Louis' Lunch broils hamburgers, steak sandwiches and hot dogs vertically in original antique 1898 cast iron stoves using gridirons, patented by local resident Luigi Pieragostini in 1939, that hold the meat in place while it cooks.
Louis' Lunch is popular for serving what?

ANS:
the hamburger