4 11141.02 Question 1 • Gas jar with diameter 4–6cm, capacity at least 200ml, mass less than 300g • Half metre rule • Vernier calliper • Electronic balance capable of reading up to 500 g to nearest 1g or 0.1g • 250ml beaker • 150ml salt water solution (approx. 1.1g cm–3) • 250 ml graduated cylinder • Insulating tape Question 2 • Thermistor EPCOS B57164K471J or similar (KED471). RS 191-2229 • 1.5 V D cell • Digital milliammeter 0–20 mA to 0.01 mA • Digital voltmeter 0–20 V to 0.01 V • Connecting leads with 5mm plugs at each end × 6 • 250ml beaker • Water at room temperature • Crushed ice • Retort stand & clamp • Switch • Method of clamping the thermistor into retort stand, e.g. component holder with crocodile clips. • Dessert spoon/soup spoon • Thermometer with range -10°C to 110°C