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The transverse momentum of charged particles produced within the pseudorapidity range g = -0.36 to +1. 0 has been measured in pp collisions at Js 1.8 TeV. The charged-particle multiplicity of each event was measured with a 240-element cylindrical hodoscope system covering the range -3.25 ( g (3.25. The average transverse momentum as a function of the average charged-particle density per unit of pseudorapidity is presented. Events are observed with average charged-particle density as high as 32 per unit of pseudorapidity.PACS numbers: 13.85.HdIn this Letter, we report the first results of an experiment performed at the CO intersection region of the Fermilab Pp collider at a center-of-mass energy Js =1.8TeV. The experiment was designed to search for evidence of a phase transition of hadronic matter to a deconfined quark-gluon state. During the first running period, 5x10 triggers were collected from a total integrated luminosity of = 3 nb We report measurements of the correlation between the average transverse momentum (p, ) and the chargedparticle multiplicity in the central rapidity region. The (p, ) may be interpreted as a measure of the temperature of the hadronic matter formed in the collisions, while the particle density in rapidity is proportional to its entropy density.Structure in the distribution of (p, ) versus multiplicity, in particular, a rise in (p, ) followed by a plateau and a second rise after the plateau, could be interpreted as one of the signatures of a phase transition in hadronic matter. Similar measurements at lower center-of-mass energies have previously been made in a cosmic-ray experiment, at the CERN ISR, and at the CERN SppS collider.There are also high-energy, heavy-ion programs now underway at CERN and Brookhaven with fixed targets.Our detector consists of a 240-element multiplicity hodoscope surrounding the interaction region, a trigger system, and a magnetic spectrometer at 90 which samples the charged-particle spectrum with a solid angle of 0.5 sr.