The Soviet Union 's participation in World War II began with the Battle of Khalkhin Gol, with Japan in Mongolia in 1939. Later that year, protected with the Molotov-Ribbentrop Pact, it invaded eastern Poland about three weeks after the Germans invaded the west of the country.he Soviet Union 's participation in World War II began with the Battle of Khalkhin Gol, with Japan in Mongolia in 1939. Later that year, protected with the Molotov-Ribbentrop Pact, it invaded eastern Poland about three weeks after the Germans invaded the west of the country.
An altimeter does not actually measure altitude directly, but rather just atmospheric pressure. So an altimeter is actually a barometer created for a specific purpose. The altimeter uses the changes in atmospheric pressure to determine the changes in altitude.
Let's take a closer look at what these things are and how they work! Photo: Altimeter watches, like this Suunto, are popular with hikers and mountain climbers. Some use built in barometers; others rely on GPS. Photo courtesy of Steve Cyr, published on Flickr in 2012 under a Creative Commons License.